I'm not tied to a breed at all, but a large dog would be inappropriate for the size of the flat and my current weekend habit of driving out of the city and going for an 5-8 mile walk in the country is better suited to a medium dog that isn't excessively docile.
Just as a suggestion, people have a lot of success keeping sighthounds happy in flats. They are super docile at home and resting but live for chasing rabbits and squirrels on walks in the country...
I'm not tied to a breed at all, but a large dog would be inappropriate for the size of the flat and my current weekend habit of driving out of the city and going for an 5-8 mile walk in the country is better suited to a medium dog that isn't excessively docile.