We stayed for two nights here and it was really comfortable and convenient. They are very quick to response and that was really helpful. The location was great however it is on the cobblestone and lots of slopes (like everywhere in Lisbon), so it was a little hard for us to carry big suitcases.
We booked one day before, and at the time we arrived to the room, the cleaning had not been finished however, the cleaning persons soon arrived and started. They said that there was a sick person missing so it has never happened - we trust it because other than that was perfect! But only, in the night time two of us took shower continuously and the hot water run out, but it came back in the morning.
They let is store our luggage in their office in the center of Lisbon until our train time, and it was very kind and helpful. We recommend this place for two to a group of four guests!