[StavrosK]

As a data point, I went to Barcelona for a month (because remote work) and stayed in a flat with roommates etc, the full citizen thing. I loved it, I worked at home during the day and went out/made friends/saw the sights in the evenings and weekends. It's only one place, as I just roam around Greece usually, but it was a very positive experience.

The hardest part was meeting new people in the beginning, but meetups quickly changed that and I had a blast. I would definitely recommend going to a new city for a month or two (a month is a bit inconvenient, you have to go right when you're making new friends and enjoying yourself).