I stayed at this place for 1,5 months and was overall very happy and satisfied. The location is great - right on the line between lively Bairro Alto and calm and cozy Principe Real. The street is quiet and especially in the bedroom, you can find peace for a good night's sleep.
The apartment is small and I don't think I would find it very attractive to share it with anyone. There's not a lot of light because the ceiling is so low, but I didn't spend much time inside the apartment anyway. Filipa is easy to communicate with and does a great effort to make one feel good and welcome.