Excellent value for the price. The guesthouse was clean and well decorated, with a fully equipped kitchen. Tap water is drinkable. The room looked just like the pictures. Very comfortable and modern.
The guesthouse is close to the train (Benfica station) so it was easy to travel around Lisbon and to Sintra. There are also a couple bus stops nearby. The neighbourhood was quiet and seemed pretty safe to me. (I say this as a female who was travelling solo.)
There are some affordable Portuguese restaurants nearby that are open until late (10-11pm). For groceries, there are two Minipreços that are about 10 min walk from the guesthouse. For hiking/walking in nature, Parque Florestal de Monsanto is close by but you have to walk along a highway/road to get there.
Overall great guesthouse experience and nice location. I would recommend this place :)