As Jane says, there are flats and there are flats.
When I divorced 16 years ago I moved into my lovely ground floor flat, with private garden, in the middle of London next to the Thames. To say I love it here is an understatement.
As to neighbours - unless you live in the middle of nowhere, you are at the mercy of your neighbours: so many tales on GN of those in houses having disputes over shared drives, noise, fencing, boundaries, noisy DIY, unkempt gardens, etc.
At least in a well-managed development with a proper lease, you have some basic rules!