The flat is pretty removed from Lisbon's center so you have to walk about 40 minutes which can be (depending on the route) a nice stroll trough very calm and residential neighbourhoods. There are also several busses taking you directly to the center.
The surrounding area of the flat itself is very loud. There is noise from a huge road and you hear planes starting and landing all the time even when windows are closed. As there is no aircondition (or heating, this might be relevant for winter) this must be horrible during summer. The rooms of the house are also not soundproof at all – my room was upstairs, I still could hear the main entrance open and close every time.
I was the second guest in my room so it was very clean and tidy but there are a lot of things that need improvement e.g., sockets, hooks for clothes or towels, there was a tv but no remote ... Same for the bathroom: Clean and new but this might change very quickly. There are only two bathrooms for up to 18 persons so I had to wait quite often and the floor was kind of flooded sometimes. Additionally this room shares a wall with the bathroom which seems to be made of cardboard. The house got cleaned daily by a very kind lady.
I hardly used the kitchen, it was clean, there were some basics like salt but no coffee or tea. there is also no bakery or store nearby. At least I didn't find any.