We spent only one night at Paulo's flat, and our experience was great. We were welcomed by his mum, a very lovely lady who also gave us some tips about the city. The space is very comfortable, well equipped and clean. Also, the nearest metro is only 1 minute far, but we barely used it (it only takes 15 mins by foot to reach the city centre).
Overall, competitive price, cleanliness, free cookies and porto wine and good location! Hard to beat :)