First off, if you're looking at Sérgio's place on Avenida Da Liberdade, it's a great location (opposite Avenida metro stop), and no more than a 10 minute walk from Rossio. For a central location, it's really quiet and the apartment itself is very well appointed, with the added bonus of a terrace that gets the sun streaming in, in the early morning (we were there at the end of April). The apartment itself is very clean and has all the amenities you would want. Sérgio's communication was excellent and he responded almost immediately to any questions. If you happen to turn up in Lisbon without having done any research into what to do / see etc, don't worry! He has put together his own fabulous, comprehensive guide to Lisbon, which also has many of his own personal recommendations. Even though we had done some homework on what we wanted to do in Lisbon, Sérgio's guide was really helpful. A great host and we would recommend him and his apartment highly.