A very nice apartment in a great location. The Bairro Alto is typical, charming, with still some flavor of real neighborhood life. Interesting restaurants and bars are just around the corner, for ex. in the very plesant Plaça de Flores, which is visible from the windows. Very conveniently, there's a (very) small supermarket 3 minutes from the apt, while a baker and a butcher are even closer. At the same time, the apt.'s street is quiet, no noises from the night life (the back of the apt. opens on a nice garden, to which all apt. guests have access). We were able to sleep very well.
In terms of the apartment itself, while the bedrooms are small, they're full of light, as is the living room/kitchen area. Good equipment, you can do pretty serious cooking there. Very good, immaculately clean bathroom.
Little downside: the apt. is not very close to the subway (Rato station), at least 12-15 minutes walking and a steep uphill street when you go from the apt. to Rato. However, you can easily walk to the area where Parliament is (elegant neighborhood), and catch the famous 28E tram ten minutes from apt. (the bus to Belem is even closer). The charming Plaça Principe Real is also ten minutes by foot, and another ten minutes will take you to the celebrated Miradouro Sao Pedro de Alcantara