We travelled in 4, me, my wife and our 2 kids and we had a 4 days stay in the house. We found the apartment very clean and cozy. It is very well equipped, included the domestic appliances you need especially if you travel with kids (wash machine, dish washer, dryer).
The position is strategic and in a very short walk you can reach some of the main attraction and the main stops of the public transports. A stop of tram 28, the most famous in Lisbon, is 100mt from the house.
JP is a very good host, always availble to provide support and information. He gave me a lot of usefulindication about how to reach the house, to park the car and to taste typical portugues food.
During the night you could hear a little bit noise due to the passage of bus and tram, even if, honestly, we slept without problem all the nights of our stay :)