We have chinchillas (a mother and her two month old son) in two habitats in my daughter's room. She says they play quietly some nights, some nights she hears nothing. We only separated them yesterday, so I can't say how it will be after they settle each in their own habitat, but once they got used to their new home with us at first, they were perfect little angels at night. Busy, but quiet. Of course we take out their belled toys and their wheel at night, but all their other toys and amusements stay with them. We get a lengthy play time each morning (free running in a large empty bathroom) and in the evening (cuddles and lap play).
Chinchillas are a lot of learning about a new species, but with their independence, cleverness, affection, wit and empathetic nature, I find them a perfect companion for my 13 year old daughter, and myself.
The little kit especially seems to understand (and like) when I need to have him in my lap for cuddle time. And the Mother is just a hoot, redecorating, tidying and letting us know it is definitely HER habitat, we are merely guests
So, on the whole, very good companions to have in your room, provided they can get enough quiet time to sleep during the middle of the day. Some people find this a plus, as they go to work/school during that time. Your little chinns will be happy to be left alone to sleep, and happy to greet you when you get back. Great pets!