I spent 5 days at Christian's place. The location is excellent, very central and well connected, surrounded by a variety of nice restaurants and the perfect base for your walks around Lisbon. It is a very tiny apartment in an old building (1901), but it is extraordinarily quiet despite being so close to Avenida. Felipe, who actually takes care of welcoming you, is very responsive and gives a lot of useful information. Plus, he really knows the city and can point you in the right direction, whatever you need. I thorougly enjoyed my stay and would come back again!