I stayed in Patricia's apartment for 5 nights with two other friends and we highly recommend this apartment to anyone staying in Lisbon.
Very clean apartment with everything you need. It's in a great location with transport walking distance from the apartment - 2 train stations, trams and buses.
Patricia is a great host. She met us at the apartment and gave us a brief intro to Lisbon and recommended places to go to. She is also very quick to respond if you need anything.
I would highly recommend this apartment to anyone staying in Lisbon.