I, absolutely, recommend Carolina's and Diogo's place. It was not only exceptionally clean but also extremely cosy and prepared to the slightest detail to assure maximum comfort to the guests.
The apartment is very well located (5 minutes away from the nearest metro station, right in the heart of Lisbon) and lavishly decorated.
Diogo and Carolina welcomed us in the best possible way, with delicious treats and a big smile (despite our late arrival). They gave us precious tips and mede us feel at home. We´ll definitely go back there on our next trip to Lisbon!