Eloi is a very friendly host, he showed us many interesting and useful places on the map.
The location of the apartment is perfect! Very close to São Bento trainstation and many metro-stations. There are many restaurants and shops in the neighborhood.
A downside was that there're many pubs/restaurants in the alley next to the apartment. So sleeping with the windows open was almost impossible because of all the noise (continuing till early morning). Also, in the morning there was a lot of construction work going on right in front of the windows. The beds on the other hand were very comfortable. :)