A lot of people are pro-apartmemt before living in one, so here are some fun facts:
Apartments usually have a maintenance cost, that covers as little as possible while still costing a lot. You never really own the flat, the building company does.
You often have a communal garden; it's looked after by the lowest bidding contractor. Not all flats have balconies, so you are unlikely to have your own.
Fear of fire and flooding - if someone else messes up, your stuff is toast/soaked. Insurance companies love that extra risk, it gives them an excuse to charge more.
No flat has good sound proofing - the baby screaming downstairs at 5am and the thunder of the morbidly obese person upstairs going to the bathroom at 1am will denote your new sleep schedule (i.e. disturbed)
I hope you're in for deliveries - apartments have no safe spots to leave things.
You will not be able to afford a flat with the same floor space as a house. I'm sorry, welcome to your new coffin.
Good luck drying your laundry (spoiler, your living room is going to have a laundry rack).
Good luck owning a bike (it's either the bike or your laundry, take your pick).
Vocal intimacy becomes a community event.
Living in a flat is a pile of little miseries grouped together.