I stayed in this house two nights. The experience was very good, only two small problems. There is no lift and the house is in the foor floor, so is a bit hard to go upstairs with the lugagge. An the second, that it has nothing to do with the house, but with the neirbourghs, it is a "nice" rooster that wake up you early in the morning.
But everything else was very well. The house is clean and cozy. The beds are comfortable and the views are fantastic. It is very near of Plaza del Comercio and Chiado. The hosts have been very helpfull and nice.
If you want to stay in a original house in the heart of Lisbon, this is a good option.