The main reason to stay here is that Pedro is a great host. When my original airbnb booking went awry and I had to find a place on the same day, Pedro was able to check me into the studio within 2 hours of contacting him. Pedro went out of his way to make sure that I had everything I needed. The flat is well equipped and everything was in a good state. Pedro also had someone clean the flat in the middle of my 5 week stay for no extra cost.
There are some things that are important to know however in my opinion if you are going to stay in this studio. While it seems impossible to find a building in Lisbon where you don't hear your neighbours, the upstairs neighbours were super noisy. Constant foot steps and running back and forth all day long. The studio's only windows are right on the sidewalk, which means that you will hear everything happening in the street. If you, like me, have light sleep, you might find it difficult to have good sleep.
Aside from that, I would definitely recommend staying in one of Pedro's flats.