My stay at Paulo & Marta's place was great. Barrio Alto is a prime location; very central to many sights with lots of lively bars and restaurants. Paulo was very friendly and helpful, and he met me at the apartment even though I arrived late in the evening...he gave me a lot of good tips on sightseeing, restaurants and nightlife. Paulo also provided a portable wifi device that enabled me to access the Internet from anywhere, which was extremely useful. Even though the apartment is in an area with bars that are open late, I had no trouble sleeping since the bedroom is away from the street and quiet. I would definitely stay here again the next time I return to Lisbon.