I had a great stay. Nicely renovated and ideally located apartment, in an authentic and not too touristy area. Only 5 minutes away (walking) from the Anjos and Intendente stations.
Small precision nevertheless, because I read several comments which mention the calm of the accommodation: it is true that the environment is rather calm, since the apartment is in a quiet street, but on the other hand the sound insulation of the accommodation is not perfect. E.g. there was a baby on the lower floors whom cries went through the stairwell to my apartment, and in the evening I heard the garbage trucks emptying the trashs. Nothing dramatic, actually you will hardly find a quieter accommodation in Lisbon, but just don't expect absolute silence.
That said, it's a very good address: insanely comfortable bedding, fast and stable internet connection, small supermarket 30 seconds away on foot, plenty of good restaurants in the area, and Susana is a very responsive host.