We enjoyed our stay at Marconni's apartment and would recommend to anyone visiting Lisbon for a long weekend or short stay. The location is really great: close to Rato metro station (10 mins walk), close to many bus stops and bus routes and walking distance from a lot of restaurants and cafes. There is a good supermarket only a minute away.
The apartment is well-equipped with a full kitchen, washing machine, tumble dryer and other facilities. The bed is especially comfortable and the internet connection is very good. It doesn't get a lot of natural light (the bedroom doesn't have any external windows) but as we were out exploring Lisbon so much that wasn't an issue for us. I recommend bringing ear plugs as it is an old building and as the floors are thin, you can hear the upstairs neighbours.
Marconni was a flexible, friendly and helpful host. He communicated very quickly and efficiently.