Me and my wife stayed at Frederico's apartment for 4 days. We did not meet Frederico but he was very quick to respond to any of our querries. His wife Joanna met us at the apartment and helped us carry our luggage up to the 4th floor (there is no lift). Apartment is very centrally located and right next to the metro station which makes getting around very easy. Apartment itself is very well equipped and cosy. Air conditioning is a big plus. Bathroom might be a bit cramped for bigger people and the bed is a bit squeeky but I wouldn't hold that against the apartment. Overall very nice apartment and would highly recommend it!