Great place to stay, it's well furnished, spacious, clean, and Marco made us feel really welcome - i.e. a nice bottle of Portuguese wine.
The appartment is in Alcantra district, there are some really nice restaurants and cafes in the area. The street is really picturesque and there are plenty of public transports at a walkable distance (bus, trams, trains). Lisbon center, Belem, Sintra, Cascais are all easily reachable.