the visual space is important. if you look into a room that is essentially clean and organized and you see things in there that bother you or feel like clutter--like your exercise ball and the exersaucer--then it's time to take a hard look at those objects.
even if you use them every day, can you live without them? are there alternatives that you and your son can do that would not involve a large object?
in regards to laundry, i know how hard it can be having to use shared, etc laundry facilities. but i will tell you that having a minimalist wardrobe makes it a lot easier.
when my DH and i first lived together, we lived in a small, studio apartment. we had a lot of stuff. this was before my truly minimalist days. i longed for being minimalist (and so did DH), but neither of us knew how to do it.
our laundry facilities were across the street, so not a far journey. but we both had a LOT of clothes, and we would wait until we--quite literally--had nothing to wear. we would wash our laundry in our PJs. we would have something like 18 loads.
i'm sure you can imagine that 18 loads to wash and fold was an overwhelming task!
over the last few years, DH and I have refined our wardrobe down to rather bare essentials. we each have 6 shirts (he has two dress and four long sleeved of different sorts) and 6 undershirts (his are colored short sleeved, so he can wear them out in summer, mine are takes); we have one suit each for dressy occasions; we have 4 pairs of jeans each. etc etc etc. it's very minimalist.
all of our family's clothing--DH's, mine, and DS's--fit into one 6-drawer dresser and we have 1 hanging clothes bag that holds dressing clothes and out-of-season coats. i even have scarves (like your head scarves)--down to a minimal 3. and i love scarves!
by doing this, we have to keep on top of laundry and each load is both easy to wash and easy to fold and put away. we don't feel overwhelmed.
i do a load of laundry every other day. currently, it is in the home where i am staying, and prior to this, in our own home, but prior to that--when we started with minimal wardrobe--it was a laundry mat that i had to *drive* to. so, i would go twice a week. it would be 1-2 loads of laundry to wash, dry, and fold. the whole process would be 2 hrs tops, and i would "reward" myself afterwards by doing something fun!
then, when i got home, i would take the laundry basket (it would take only one basket), and put everything away in the drawers.
by going down to this minimalist wardrobe, we saved a lot of space for storage too. our bedroom had a walk-in closet. i was able to store all of DH's action figure collection, MIL's gifted christmas ornaments collection, and a variety of other storage-y items.
when we finally minimalized completely (to move to NZ), i was shocked at what was in that closet. boxes of old sheets, for example. nutsy stuff. i just hadn't looked at it because the closet was so organized. and looked clean when i went in there. LOL!
anyway, if laundry is an issue for you, i do recommend going to the most minimal wardrobe that you can. then, washing doesn't get overwhelming. and finally, organizing your dressers and closets to accommodate--easily--what you have so that you are motivated to put everything in it's place.
in regards to the kitchen--if this is also an issue for you--minimalism is also a key. we decided--after we realized we never have more than two guests--to go from service for 12 to service for 6.
how did this help? my husband hates doing dishes. so he'll just keep using all of them until all of them are used up. well, that would be 12 plates, 12 salad plates, 12 bowls, 12 glasses, etc. my process is to wash my one dish and then use it again for the next meal and so on. but he likes to pile it up, then fuss while loading the dishwasher, and then fuss while unloading it.
so, when we went down to 6 dishes, we would use 3 for breakfast, and then i would wash them and put them away. because, you see, it was only a few dishes and didn't feel like a lot. then we would have lunch and dinner, and i would wash and put them away. it didn't feel like a lot.
my husband loved how "clean" our kitchen always was, even though all i did was wash the dishes. but even so, he got into the act.
now, he uses a dish, he washes it and puts it away. he'll even wash all of our dishes and put them away! it's a miracle!
by simply having less in the kitchen, i have less to keep up after. we then had more space for food, tea, etc, so much so that we didn't even fill the cupboards! and i had a very, very small kitchen with very little storage!
so, the truth is, it is possible to get there, but as you get deeper into it, you have to make tougher choices--do we really need the exersaucer? do i need 20 different head scarves (i know you do head covering, but one of my good friends does also, and she has three scarves)? do we need the panini press (just an example, i don't know what you have or don't have!)?
even if it's things that you use, you might discover that you don't need so much of whatever you do have, or that what you do have and use you don't really need. and then, you'll have less but you'll live more!