Bruno's apartment is very central from all places - but mind you it is in a perfect old-town charm locality and not your posh uptown luxury zone. However we liked it - and we felt like locals.
The apartment itself is fantastic - secure, spacious and nice (except maybe needs a bit of work on all internal doors which don't close easily). Most amenities in the apartment were more than sufficient - though heating might need a reinforcement if you are traveling in Dec-Jan (Lisbon does not need heating otherwise).
Bruno is excellent in communication (in many languages) - very quick in responding to our questions and also suggested a lot of local tips and info for us to visit. He was reactive to our needs, resolving the minor hiccups and helped a lot during our stay! Cheers!