Doesn't get much better than this.
Place is in a perfect location (close to all the action, but tucked away enough so that noise is not an issue... not trivial in Lisbon!).
Apartment is incredibly cozy, and incredibly well stocked (they have cheese and meats for you in the fridge, wine, and fresh bread when you first arrive).
Hosts are immaculately friendly, helpful, and available at any time to help.
If you are staying in Lisbon, this is the place!