It was our first experience with airbnb and it was perfect! It is not the cheapest apartment but it worth all the money! The apartment is perfect for a 4-5 day trip to Lisbon. To the center you can take one of the old trams(10 min to praca do comercio). If you want to make a trip to the beach you can take the train 5 min away from the apartment.
Ana was great and could answer all our questions(even called us a taxi to the airport at 6.00 a.m.)