I love Warsaw as a nomad. It feels alive and a bit rough around the edges. Old brick buildings sit next to shiny towers. Winters get cold, summers are warm and green. The cafe scene is strong. I once stood in line for dumplings by Nowy Swiat and ended up working on my laptop there for hours.
Most travellers enjoy the fast internet. Wi Fi in cafes and coworking spots is solid. There are lots of coworking spaces and meetups. For some, this will be amazing. The cost of living is lower than Western Europe but not tiny. Food and transport are cheap.
Things to do are plenty. Walk the Old Town. Chill by the Vistula river in summer. Museums, jazz bars, parks. The expat community is active. You can find coffee, code, and new friends in the same block. Arguably not the best beach town, but it is a great city base for work and play.