Oliveira's place was great. The Arroios neighborhood is a nice balance for visiting travelers--very convenient (the Green Line metro takes you right into the city center only a few stops away, and the Red Line five minutes away at Alameda will take you to a number of other useful and interesting places, including the airport) but far enough from the city center to feel fairly quiet and safe. The building is pretty tranquil and the whole apartment, including the room, was clean, quiet, and well-kept.

I did not meet Oliveira in person, but his friend Carlos, who helps manage the property, checked in every day and was immensely helpful to me in terms of getting situated and also getting to the airport (I had a very early flight out, before the metro opened, and my Portuguese probably would not have been up for navigating a taxi reservation phone call.)

I would definitely stay at Oliveira's place again. Good value for the price and a nice way to see the city.