We where very good received by Sergio (host of Rent4Rest). Gave us some good local (map) tips. The apartment is very clean and in a nice (central) location in Lissabon.
The only thing is that there is a big gap underneath the entrance door. Therefore you can here loud and clear the other guest when they arrive or leave from the upper apartment (for us not a problem). And when you arrive make sure that you push in the water-stopper in the sink (kitchen). We had it open and then you will discover some smell from the drainage, when its closed it is fine, no problem.
General we are satisfied for price-location-cleanness.