In general the apartment is nice, though as one might expect, a bit smaller than it appears in the photos. Every square meter is optimized. One thing to note is that the toilet is downstairs and the bedroom is upstairs. That may or may not be an issue, depending on your "needs." We found the apartment a bit overpriced compared to local hotels which also include breakfast, but that is a very individual assessment.
A little side note: the towels that were provided at first seemed old, rough and scratchy. But in fact, after a washing, they came out nice and fluffy...which just indicates something about the way the apartment (laundry) was prepared (i.e. in terms of care regarding the final touches).
The neighborhood is central enough and relatively quiet, so do not expect to finds tons of restaurants, shopping or cafes around the block, though you can walk to places or take public transportation. Do note, the apartment sits on one of the many LIsbon hills which again may or may not be an issue depending on the individual guest.
In terms of service, we were disappointed. From the check-in, our host would not allow us to drop off luggage in advance of check-in time. There was not any explanation about a check-out the same day, cleaning, etc., simply a "no"regarding the luggage drop-off. It was not like we were looking to take possession of the apartment early, we just wanted to drop off luggage since we had flown all night and it was a very early arrival. It did not seem, even if there was a cleaning in progress, that the dropping of 3 bags would have caused much of a disruption. That lack of explanation, empathy or flexibility was not very airbnb-like. So we were obliged to hang out for 8 hours at the airport. :-(
Also, the key was left in a drop box. That was no problem, but we were also told via our local designated contact (since the host was abroad) that there would be someone there at 3PM (our check-in time) to meet us. That did not happen, and when we whatsapp'd this person with several questions regarding some appliances, the trash situation and the functioning of other aspects of the apartment (mind you, this was a 2 week rental!), well, in fact, this person never showed up to clarify things. Instead there were several text messages that never really addressed the situation.
Therefore the review is a somewhat mixed bag, though in terms of the service one would expect more attention from a 2-week rental on airbnb.