The flat is the perfect place to discover Lisbon : it is close from Rossio, the castle, you can do everything by foot if you like to walk.
It is really nice, with everything you need to feel like home.
And the best is that Joao is really nice, he gave us a map and told us what to visit, where we can eat ... he checked during the stay if everything was ok.

Don't hesitate to come to his place !