Location, location, location. The flat is in a peaceful area with many restaurants, coffee shops, etc. It felt safe to walk at night and there were many nightlife options within a walking distance. Uber rides to Centro and other more touristy areas were very reasonable by European standards.
The flat itself is adequate if you don't mind the bed on a harder side and the fact that the flat feels a little tired. Everything in the apartment worked well though.
Communication was again adequate, with all the key information provided at a good time.