I had a terrible experience, both with the apartment and with the landlord. For someone in the service industry, this person didn't demonstrate any people skills, using Covid as an excuse for an agressive and unkind behavior. As for the apartment, it is terribly isolated, you can hear every little sound in the whole building, every step and door, while the noise and music outside go on really loud until early morning hours. This whole experience unfortunately left me with a very bad memory of first 24 hours in Lisbon.
ps: if you still for some reason have to sleep there, which I strongly recommend not to, I strongly advise buying several pairs of the strongest earplugs.