1. When does your child go to bed?
Highly variable, when they start acting tired. At 7 months, the twins were probably going to bed (with me and usually DH) around 9ish. DD#2 is usually tired earlier and she and I would like to be in bed around 8. . . but that's hard when everyone else is still awake!
2. When your child goes to sleep who is with them?
At 7 months, always ME!! As they got older, DH would take over bedtime duties sometimes.
3. What does your bedroom look like?
Messy! Oh, you probably mean bed arrangements

We have a king and a twin pushed together. They're on bed slats on the floor. Typical sleep arrangement is DH (next to the wall), DS, me, baby (at the edge of the bed) sleeping on the king (sideways - we're short and it's wider than long); DD#1 on the twin. We have a small house and a small master bedroom, so we have one dresser in the room with my clothes and DD#3's clothes, a changing station on the top, and a tall skinny dresser in the corner for DH. There's enough room to walk in, close the door, and reach the bathroom; but if you want the closet, you walk across the bed.
4. How does your child nap?
I've always nursed my children down for naps. With the twins, I usually stayed in bed with them and napped myself or read. Sometimes that was by choice; for a long time (certainly around 7 months) it was a necessity if I wanted them to take a decent nap and take it simultaneously. DD#2 has third child syndrome - if we're at home, she takes a great nap by herself after being nursed down in the bed. But she's often napping in the sling, in the carseat, in the bike trailer. . .