This unit is very conveniently located, just a few minutes walk from the core part of downtown Lisbon. Both the Baixa/Chiado and Cais de Sodre Metro (subway) stations are close by, making it very easy to get around the city.
The place was not noisy at all, and it suited my needs. It would be good for one or two people. It is on a third floor, no elevator, so if you have a bigger suitcase be ready to carry it. It definitely works as a good base for visiting Lisbon.