Stayed at this apartment for 3 nights together with my girlfriend. We were extremely happy with our stay, apartment was great, ideal for two persons but could fit also more. Nice open plan with different floor levels. Quite modern interior that mixes well with historic Lisbon setting. Rooms were clean and had all necessary amenities (iron, hairdryer etc.) Kitchen appliances were available if you wish to cook yourself. TV had good selection of channels, wi-fi worked well. There were lots of books about Lisbon and tips from owners about near-by restaurants etc. Bed was very comfortable.
Apartment is in a good location, near lots of nice restaurants and bars and it's a good starting place to explore Lisbon.
There are two different metro stations within reasonable distance from apartment.
We did not actually meet the owners as they were out of town but we got keys from a place straight across the street. We were informed about this via sms beforehand, communication with owners was good and everything worked hassle free.
Would definitely recommend this place.