The location is fantastic in the heart of the Baixo (central) district with a short walk to Chiado and Barrio Alto. Despite the central location, the apartment is not noisy as the nightlife moves elsewhere after about 10pm and it is high above street level. The apartment was clean, well equipped and comfortable and we really enjoyed our stay.
Just a couple of things to be aware of. There are 11 flights of stairs up to the apartment; just think of it as useful exercise. Also as the apartment is located right up in the roof the layout is a little quirky and the bathroom is tiny. It takes a while for the heater to warm the place up (we visited in February). Not a big deal though and I'd recommend the apartment if you are visiting Lisbon.
We had a great meal in Browns just across the street at a reasonable price and the TimeOut market is fantastic for lunch.