You are welcome! These are some good suggestions.
#1, #5, #8 Should be pretty easy to fix. The polyamorous flatsharer's are kinda funny though, but I will rework it.
#2 Could be interesting for more immersion. ATM satisfaction is just calculated from condition of the flat.
#3 I'd say the +250 is pretty balanced. But to be able to quit your job is a good idea, as it supports the fantasy of the game to quit the rat race.
#4 I have experimented with simple maps, but wasn't too happy with it. Maybe i will try again.
#6 Usually i use the survey when buying more expensive stuff, like the multi-unit houses that are unlocked later. But i will consider to have the survey be cheaper and then scale with house size.
#7 Sure, why not. Shouln't be too hard to implement.
#9 It does scale, but there is minimum cost that might be too high for smaller flats. Also hire a maintenance team for a monthly fee is a good idea. I'll consider it.
Thanks again for the feedback. It helps a lot.