Buying a flat - downsides? Please critique

[78thcat]

I can only afford a flat but I'm aware there are lots of downside to buying one. I THINK I've found the perfect flat with none of the usual downsides. What have I missed?

New flat has:
-999 new lease and a share of the freehold with 3 other flats in block, no management company, no service charge or ground rent
-Own front door
-A garden
-Top floor flat so no noise from above
-Not high rise, only one flat below (detached block of 4 purpose built flats).
-Modernish, 1970s build in v good condition so not much shared maintenance
-Single quiet person below and to the side. Have also spoken to all the neighbours - all very lovely and friendly! All single people in 50s and 60s, no kids.
-Own garage and parking

What are the other downsides I might need to be aware of? I know I have no control over who moves in below, but it feels as though everyone is quite settled and content and most people have lived there for years and years and they all get on.

I'd like to find out about the roof. I think that's really the only thing that could be communal. The gardens are privately owned by each flat so no communal grounds at all. Everyone has their own front door so there is no communal inside areas either. Block is 1970s and in very good nick. It looks like it has been well maintained.

The only communal things we had (may not be relevant to your type of property) was a communal driveway (no issues with that ever came up) and the outside of the house was painted so that needed doing every so often (possibly we bothered 2 or 3 times in 20 years and the cost was minimal anyway). Like yours the gardens belonged to each flat so that was never an issue. The one thing I was never clear on was boundary fences/ walls. Was never sure if they belonged to the houses/ flats or the other sides or if we "owned" any. But like I said I was young and didn't particularly look into it and the issue never came up. But if you don't have any "joined" boundaries it may not be an issue. (Like we had a wall next to the shared driveway and I never knew who owned it)

What about ceilings/floors, subsidence etc etc?

It might not be communal, but who is responsible for outside walls etc? Living in a flat requires either an overseer like a housing association or a strong owners association. In our flats, all the window and doors have to match so whilst they belong to us, we negotiate about when they get replaced or painted. If the gutters need cleaning or windows painted we negotiate about scaffolding in each other's gardens. We also have an agreement about letting window cleaners into gardens to do upstairs. We have an agreement that no one rents on Airbnb, when quiet hours are, satellite dish and external sun shutter rules and tell each other about maintenence. All of this gets hashed out at yearly meetings, which is written into our legal shared ownership agreement. If they've only recently bought the freehold, they probably haven't run into anything that needs community negotiation yet and won't necessarily prove capable of dealing with it.