The apartment is very reasonably sized (I don't agree with other reviews here saying it is too small) and had everything we needed for our stay. It has a really nice terrace with a 360 view of the city. We walked around Lisbon for three days and this is one of the nicest points of view from anywhere in the city.
Nuno was very responsive and made sure that we had a good experience.
There was a small logistic miscoordination due to our last minute booking, but Nuno went out of his way to make sure we had everything we needed and more.
Based on the view, the centric location and the quality of the hosts I very much recommend this place and I would definitely try to book it again if I returned to Lisbon.