Stayed in the apartment for a month. The place has fast internet which allows to work remotely without any problems. It's a basement flat and a bit dark as a result, has a terrace but no sun due to the shadows from surrounding buildings, still nice to have a terrace.
Plenty of space. I especially liked the living room, looked exactly like the pictures. The big bedroom is quit-ish but it's at the level of the street so can be some noise even though it's a small street so I had to sleep in the small living room which only has a small bed but it's extremely quiet, you cannot hear a single sound which is great if you're a light sleeper. Apart from the main door which closes very loudly when people go to work around 7am, that didn't bother me as I was up already at that time.
Like many flats in Lisbon doesn't have heating, only portable electric heater that helps but late in November it was a bit cold in the flat.
Communication was first class, had problems with the pans and the portable heater and they were resolved very quickly. The description of the flat was accurate.