I agree with the opinions of several previous guests. Isabel's apartment is a very ideal location for walking tourists.
The apartment is as described, spacious, clean and well equipped.
The small grocery shop (supermercado) below the apartment is not a source of noise. Occasional noise from neighbours is more likely to come through, but this is tolerable.
Isabel is a very good host. Despite arriving late, she waited for us and handed over the apartment personally. She provided us with useful information to discover of Lisbon.
As the next guest after us arrived a day later, she was flexible with our check-out time, which we did not end up taking.
Overall, Isabel is a very good host. I would recommend the apartment to anyone who does not insist on luxury but is looking for a good and comfortable base to explore Lisbon and its surroundings.