What a wonderful stay in Lisboa! Perfect little apartment with a great view. Hugo picked us up at the metro station and gave us a small "orientation"tour. Nice! The location of the flat is really good: near portas do sol (nice terrace), the fado-restaurants (very touristy though), tram 28, metro station Santa Apollonia (10 min), near graca, ... Oh well, everything within walking distance. Two really nice tips: go and have lunch at "Os Gazetteiros" (great food and wine, 3lunchcourses for 14€!) and visit the flea market right behind Sao Vicente.
Oh, and take the train (or a taxi) (not the tram) when you visit Belem (that is: if you don't want to be packed on the tram: really too crowded). Do try the "pasteis"! Mmmmm!
If you have time and want to escape the city, try crossing the Tejo to Cacilhas (same ticket as tram/metro): along the shore (15min walk) there is a great terrace"Ponto final", especially nice when it's hot!
Thanks again Hugo and Silvia.