Highly recommend booking your stay here! It has everything you need and it's in a great location near awesome cafes and restaurants and walking distance to the main squares and the hotspots. We backpacked around Portugal and chose this place as our last day in Lisbon and would say that it was one of our favourite places we stayed in the 3 weeks in Portugal. Maria is very helpful and gives you lots of authentic tips on what to do and go see.
I recommend checking out the Fago music in the evening, cafes nearby have great pastries and sandwiches for very cheap, lots of great shops and an ideal place to stay to walk around the city.
Bonus! You can leave your bags with the front desk before your check-in which was a huge plus for us, and when you check out since we left for our flight at 3 pm. This was one of the main reasons we booked this place but as soon as we saw our room and how clean and comfortable it was, we would recommend booking for more than one night! We loved it.