Staying in this place comes with both good things and some not ideal things as well. I think it's a choice of where you are willing to make some compromise.
Communication - ideal. Both Michel and Silvia were extremely helpful from the moment of making the booking, until leaving the apartment, very willing to provide help and prompt in their answers. Also very open to receive feedback and try to improve.
Location - the apartment is quite well placed, central, and I felt it was a good choice from this point of view. The neighborhood was not ideal, I didn't feel comfortable returning after dark alone, but it didn't feel dangerous either.
Cleanliness - was not ideal. The place was definitely cleaned before, but it was the surface kind of cleaning that works as long as every once in a while there's a thorough cleaning done too. The latter was lacking. I cannot fully impute this, as after I complained, Silvia offered to come herself and take care of it in order to make it comfortable (which I didn't take because I was already settled in). But I appreciated the intention.
Amenities - some were lacking, some were nice and appreciated. Good internet connection was a plus.
Steep stairs, as it was mentioned in other reviews, they were indeed, and I even had a huge heavy luggage. Silvia helped and it was manageable.
Quietness/Loudness - it wasn't crazy loud, actually quite quiet outside most of the time, despite the location; what can get harder to swallow sometimes are the thin paper-like walls everywhere in the building, and the cracking sound of every single step on the floor coming from the apartment above.
Whether the price quality ratio was a correct one for Lisbon, I cannot tell for sure. It wasn't the best, nor the worse, I think all in all it depends what's important for everyone, and what are the expectations.
All in all, and keeping all in mind, the stay was quite okay.