Do wonder why some of flats seem to have so many undesirable neighbours, whilst others ( like where I live) have none.
There are 25 flats in my block (23 are 2 bedroomed, 2 with 3 bedrooms). Although no age limits on who lives here, all (but one) are well into their retirement years ranging up to a hundred yeard old.
We have no communal garden, but are five minutes away from a gorgeous park kept by volunteers. All (but one) are owner occupied. We run our own voluntary Committee. Everyone gets on with everyone else extremely well. Some friendly enough to go on holiday with their neighbours, others, more private, but no problems. If a problem does come up, it is quickly sorted out by that Committee, but they ae very rare to occur.
On the flip side, we all care about each other. Someone not too well, no problem about getting shopping done for them or prescriptions collected, etc. etc.
Prior to living here, I was, for sixteen years in a small cul-de-sac in a house, did know my two immediate neghbours, but not the rest. Here, in no time at all, I got to know the people in all the other 24 flats. A flat on the market and empty required its boiler to have a service, No problem for the probate owner needing to travel many miles to be here for that - request to committee and one of us opened up the flat for BG Engineer, sat until they had done their work, and then locked it up again.
Last year a fairly new flat owner here put up (on their balcony) exactly the type of awning I had been looking for to have on my quite large patio balcony. They invited me in to have a close look, gave me all the details as to where to buy it, etc. And, when I thanked them, but said I would not follow through as it needed to be self-assembled, the gentleman there immediately offered to do it for me. An offer I accepted with gratitude.
So, I honestly do not understand what people mean about problems with neighbours in flats.