We stayed for a week at this beautiful apartment. It was spotlessly clean and supplied with everything you could wish for. The host Leonor was at the flat to meet us on our arrival and explain how everything worked. She also advised on places to go and how to get there. The appartment is like new and fantastically located so that you can walk everywhere in Lisbon or get the metro / bus / tram wherever you want to go. We got a taxi from the airport when we arrived but I would recommend getting the Metro to Martim Moniz from Terminal one at the airport as it only costs €1.50 per person rather than €40 for a taxi and the apartment is right by the Metro.
I would highly recommend staying here.