The location of Daniela's place is fantastic. Especially if you want to combine going to WebSummit with exploring Lisbon. There is a bus just 100m away that goes to Belém, it's easy to get an Uber, or just to walk into the centre of town.
The garden is absolutely stunning, and is a very nice place to have breakfast or a glass of wine in the evening.
As the flat is away from the road, it is completely quiet at night and you can sleep very well.