We had a great time during our stay at Tiago's Amadora apartment.
It's true what some people said that he doesn't always answer the messages (at least prior to the arrival) but other than that we had no major issues.
We didn't get to meet Tiago, but we met his lovely aunt that gave us the run down of the apartment and explained it all for us - great person and super sympathetic!
As for the apartment, you have it all in there: from basic amenities to touristic information. It's quite cozy too.
It's also quite well situated: right across the street from the supermarket (Pingo Doce) and at 5 min walk to the train (to go to Sintra, for example) and the metro (Reboleira), which is in the blue line - the biggest one in Lisbon and the one to take you to virtually everywhere you'll want to visit during your stay.
Overall, we recommend the apartment and we'd stay there again if we ever go back.