So, I'll start with the pro's 😌 The apartment is very well located - close to the most places one wants to see in Lisbon. It has new furniture and isolated windows (so you don't hear noise from outside if the windows are closed). The staff is very welcoming and friendly!
Unfortunately, we didn't really enjoy our stay there. The air in the bathroom was really stinking (and because of that - the air in the bedroom was stinking, too). We couldn't leave the window open at night cause it was cold, so we hardly could breathe and couldn't sleep well.
All rooms are really tiny. The toilet is so close to the wall that it is almost impossible to sit on it normally, the legs barely fit. One has to sit sideways.
Also, you here literally everything what's going on the house stairs. It was the second reason why we couldn't sleep well. Every night on the stairs near our door, someone was talking very loudly, singing, making noise. Probably happy tourists. It turns out that you do not hear tourists from the street, but you can hear them too well IN the house.
There were some other small contra's.
So, I can recommend this apartment for a couple of days in the old town (because of its location) , but not for a long stay.