The apartment itself is fine and comfortable. Location is very good, close to small grocery stores, public transportation and restaurants. Not too close but I would say within walking distance from some touristic places like Praça do Comércio or Parque Eduardo XII. We also felt very safe because it is in a central place, near stores and restaurants that are open until late. Wi-Fi worked well. Surfaces and linens were clean. Bathroom was also clean, but the shower deserves a lot more care - there was a good amount of mould in the grout and corners. There was just one outlet that was really close to one side of the bed. The other is far from bedside so you can't use your device while charging before going to sleep, for example.
There are some things that I guess are out of the host's control like the bad smell that comes from the shower drain (renovated apt, but old building, so I guess this is structural and can't be solved easily) and the noise of builders working on the surrounding buildings (not a big deal for us as they usually went from 9am to 5pm while we were out).