We've stayed just for one night and it was really nice, nothing I could complain about. The room was clean and the environment was silent. The Guest House has really good position near the subway station (Parque), so it was like 35 minutes from Airport.

Overall I can recommend it to anyone who would like to stay in Lisbon for a few nights, it isn't 5* hotel of course, but it has really friendly price and you get nice beds, shared bathroom and small shared kitchen where you can cook or heat your lunch.