Stayed here in Feb, the location is very central, most things were less than 10 min walk or two euro uber away. Flat is clean and presented nicely and we were left basic soaps and linen.
A Downside would be the low roofs and we took a couple of knocks to the head so be careful. I would have also liked more than one pillow.
You can not beat the view on the terrace though really peaceful and serene.
As for Lisbon itself we did enjoy but really wish we had stayed in Sintra and maybe popped into lisbon center for one day.