DD really is almost always happy but I take little credit. I've cared for enough kids to know even the bestest mom in the whole world can't change a temperament.
My house is clean about once a week. I clean the whole house one day a week. By the next day, it's trashed. I am absolutely amazed at how trashed a house can be with a 16 month old. Toys, food, random stuff...everywhere!
I do love co-sleeping and would probably stay up all night if we didn't have a family bed. I've had a couple terse moments but they were due to feeling bad/guilty b/c DD was in pain from sickness or teething.
I hate knitting and sewing. But I do magically find enough time to finish my school on time each week.

Not sure how that happens but it does. Phew!
Do I have enough time to relax? I say yes, but at the same time, I think my lifestyle would really harm someone who needed "true" alone time or down time. I'm just not that type of person so it works for me.
I don't know about multiple kids yet. I'm preggers right now and happy with the idea of another baby. I'm scared to put it in words in case it sounds arrogant or naive...but I remember everyone telling me I was going "face reality" with having my 1st child...and I don't know what their reality is but I am very happy to be a mama and have a baby. I hope the same is true the second time around. Everyone keeps warning me of my soon to be dire situation...hopefully I will just be busier...and happier.
This image you have...of mamas being perfect and having it all together...maybe you are mistaking their joy and comfort in mothering for a peaceful/perfect life. I don't have a perfect life. I forgot to pay a bill. I yelled at DH b/c he left the cabinet doors open again.

(sorry DH!) My back is killing me, I could stand to exercise more, I never scheduled Easter family photos, I need a shower...lol need I go on...