Very nice apartment! Clean, well furnished, in a very good location (directly in the center of Lisbon, close to the metro and to the tram for Belem, 5 min walking to the station for Sintra).
You need anyway to consider that it is at the third floor in a building without elevator; this wasn't absolutely a problem for me, but it is something of subjective.
I couldn't meet directly Rui, but he has been fast in the replies and willing to help.
The photos correspond to what you find.
This is the first time that I've used AirB&B and I can say the overall experience has been positive.