He spent his first 2 weeks sleeping in bed with me holding him - it was the only way he'd settle and if I laid him down flat, he seemed to have some reflux issues and would gag and cough. So I propped him up on my arm so he was slightly inclined. That problem seemed to clear up mostly so I moved him to his crib in his own room and as long as I keep it very warm in there and swaddle him tightly, he sleeps about 4 hours or so before waking up to eat, then usually another 3 or so.
For most naps, he sleeps in his bouncy chair.
When we're downstairs on the main level, M normally sleeps in the Travel Lite Crib (small Pack n' Play) in the living room. Sometimes he's in the Mamaroo but I much prefer him lying flat.
At night he sleeps in the bassinet beside my bed. We don't have a room or crib set up yet.
We also don't have a crib set up for her. Soon I'll transition the boys in together and she'll go into the nursery. Right now she sleeps mostly in the cosleeper next to my bed. I do sometimes keep her in bed with me like if I fall asleep nursing her side lying or am too tired to reswaddle her and put her back in the cosleeper. Those are usually early in the morning though.
During the day she sleeps in the rock-n-play when I put her down to sleep. Sometimes I just hold her like right now we are sitting in the garage watching her brother play in the driveway. She's snoozing.
At night we cosleep. He sometimes starts the night out in his bassinet/playpen, but after the first feeding I just keep him in bed with me.
During the day, it's in my arms, in a carrier/wrap, in the swing, or in his bassinet. Depending on what I need to get done!