I stayed here with my parents-in-law and family for a very short two day visit to Lisbon. We found the location very convenient in terms of accessibility to both the metro and by bus. It was also helpful to be walkable to a big supermarket.
The flat itself was beautifully decorated and very clean. It had lots of conveniences like a dishwasher (which we used) and a clothes washer (which we didn't but should have). The windows allow lots of light and air circulation when open and are well insulated against noise and light when closed.
Mário was a very responsive host and welcomed us very well with fruits and especially some milk for my young daughter - which was especially appreciated after our late arrival. Were I to return to Lisbon I would certainly consider staying here again!