Maria and Carlos are great hosts. They are super attentive and have thought of everything we could possibly need, even some first aid stuff and they welcomed us with a bottle of wine and some fruits.
The flat is a bit small but totally fine for two people.
The location is really good if you want to explore Lisbon by foot and you can get even to the castle in no time. The bus station isn't far away either so you can reach everything easily.
Unfortunately we had cold water in the shower most of the time and some seconds it was really hot so showering was a bit uncomfortable.
You had to close the windows at night because it was really loud because of the bars and restaurants around but then it was OK.
But these are only little details, all in all we really had a great time in Lisbon and in the flat and felt like home.