It would be nice if you also had a "dog friendly/accessible" metric, that's part of the reason why living in a city center isn't reasonable for me personally, I need green spaces rather than tall buildings.
[1] http://tynan.com/gear2014 [2] https://levels.io/the-100-thing-challenge/ [3] http://www.tropicalmba.com/digital-nomad-packing-list-2014-l...
Have less stuff.
Most people probably end up having a storage unit (either at family or a storage business) "back home" for stuff they want to keep long-term but is too big to bring everywhere.
Being minimalist helps, of course. Major items: Clothes and computer. The rest is minor/small.
That said, when we packed up to move we put 20 of those staples file boxes in my parents' basement, so we sort of cheated on storage. When we look back now, though, we're pretty certain that we could go back and happily ditch most of that.
Also, we're living in old city Krakow right now, and there's a plentitude of parks. I saw a ton of green space in Wrocław and Warsaw, too (Warsaw has a huge city park), and it can't just be Poland that values green space. I assure you it's possible.