My group (three couples) rented out Paulo and Carmela's entire space for two nights. It's very spacious (5 bedrooms, a living room, and a kitchen/dining area) and beautifully decorated, occupying most of floor 1. Although the listing has two bathrooms, they are really two toilets and two showers in the same bathroom area. Though it can get a bit chilly, there are portable heaters to keep the bedrooms warm through the night. The immediate neighborhood area is relatively quiet and peaceful.
That being said, the location is quite central, a close walk to Principe Real and only about 10-15 minutes walking to the restaurants and bars of Bairro Alto and Chiado.
Paulo and Camila were super accommodating, easy to contact, and even showed up to give us tips on local sights and activities.
Overall, a super pleasant stay and we would recommend to anyone visiting Lisbon!