It's difficult to add to the previous reviews. Joao is a great host and the apartment is generously decorated and appointed. The location is in the middle of the entertainment district and provides easy access to Lisbon's busy centre.
Most reviews comment on the high level of noise overnight. It's the price you pay for being in the centre of the action. Just be aware that it's difficult to avoid and if this is a concern you should look elsewhere.
Nevertheless we had a great time in Lisbon and Joao was a wonderful host.