I can only echo what has been said about the place already - location is great, the apartment is spotless and fully equipped with everything you might need. We were two couples and had loads of space, can easily accommodate 6 people. All rooms are lovely, with plenty of natural light and high ceilings, the beds are very comfy and sound proofing from these windows is fantastic, especially since the place is very close to Praça Luís de Camões. If you're into cycling or jogging, in five minutes you can practice along the Tagus river.
There are loads of places to eat and drink around, and several supermarkets nearby.
Chiho and Nuno are great hosts, communication was a breeze. Thank you for a memorable stay!