I stayed here for four days with two work colleagues. It's an excellent location in a good part of town. Pretty much all of Lisbon is covered in tourists these days and this is certainly one of the hot spots.
There are two important things to keep in mind regarding staying here. As I share these, keep in mind that this part of town is quite old, so there will always be significant trade-offs which anywhere you stay:
1. The master bedroom faces the street with really beautiful balcony overlooking the street below. We loved hanging out on it and people watching. The street gets loud until 2 or 3 am because there's a pretty popular bar down there along with various restaurants. It's not unusual to have a loud street in a European city - they like to get late dinners and drinks and the cafes and bars are everywhere. If you have trouble with noise, that may not be the best thing. I stayed in this room and brought earplugs and that worked well for me.
2. Besides the master bedroom, the other two bedrooms don't have windows to the outside. They each have a frosted window that faces the room next to it. That means that air circulation takes a bit of a hit, and if one of your neighbors has the lights on at night your room will be lit up quite a bit as well.
Overall, I can't say enough good things about the check-in process, it was a really nice introduction. They were very flexible and sent an excellent guide on the city to us which I really appreciated.
The wifi works very well, the place is very clean and has excellent amenities for cooking, washing your clothes, and a really nice central area to hang out.