We really enjoyed staying in Nuno's flat. It is clean and stylish, right next to the cathedral but it doesn't feel too touristy. Within a very short distance are some nice restaurants and cafes - Nuno recommended some very good ones - and you are 15-20 minutes walk from the Bairro Alto area which is the main area for restaurants and bars.
Nuno was excellent to communicate with, always quick to respond. We were trying to book a restaurant for dinner but they only spoke Portuguese so he very kindly rang up and tried to book for us (they were full!).
We can definitely recommended Nuno, his flat and Lisbon.