The biggest value of this place is that you can feel the authentic Lisbon's atmosphere. There's a lovely narrow terrace where elderly neighbours hang their laundry, and the windows of other appartments are so close that you could almost talk to people who are inside ;)
The next plus is the location: right in the center, close to all touristic spots.
Everything in the appartment was fine. The only small issue I had was with the shower that didn't fully absorb the water (but my stay was only for a couple of days so it wasn't a big deal).
The communication with Isabel was great and quick, I'm sure she would helped with the shower if I asked.
I can say that the positive reviews I've read here turned out true.