Clara's apartment is in a great location, with many (less touristy) restaurants nearby and just off Avenida da Liberdade. It is an easy walk from there into the central square and old town. The apartment itself has everything necessary for your stay - it got pretty cold when we were there (mid January) but there were plenty of heaters and spare blankets. The apartment is situated on quite a steep hill (although this is common in Lisbon!) and the stairs leading up to the apartment are steep and narrow, so just be wary if you have lots of luggage. We never got to meet Clara in person but she gave us clear instructions on how to get into the apartment and was very quick at responding when we had questions, even booking us a taxi to the airport when we left. Would definitely recommend to anyone visiting Lisbon!