That was my second stay at Isabel's place. Needless to say it was all as great as the last time, and I look forward to staying there again.I would say the apartment is comfortable for 2 people (sleeping on the same bed).
If you want to experience a different neighborhood in Lisbon, one that is not in the tourism guides, I would definitely recommend this one. It's close to a few Portuguese restaurants and also conveniently located close to Colombo (a big shopping mall with anything you may need).
The apartment is also a ~10min walk to the nearest Metro station, which takes you mostly anywhere in Lisbon in around 20min.