We've had a great time in Lisbon. The apartment was very clean and spacious. The location is great: in the city center near the restaurants and the public transport. It's located at the river, so you don't have to walk steep hills to get to the apartment. Inside the apartment, it was quite, no noise from the streets.
Nuno is a very kind host. He recommended nice restaurants and was easy to contact. We could leave our luggage at the apartment after check-out time, which was very nice.
We definitely recommend staying at Nuno's apartment when visiting Lisbon.