The flat was really nice and the hosts as well! They allowed us to have an earlier check-in due to the scheduled time of our arrive in Lisboa. The only “issue” was that the house hasn’t a normal way of heating, so it was a little bit cold (our trip was in February) and that I guess there are some problems with sewers in the area because there is a pretty bad smell coming from the toilette. Anyway, the flat was really clean and all the facilities are really close to it. It is very well-located also for the best place ever for sightseeing (Miradouro Senhora do Monte).
The hosts are really available and reactive.
I’d suggest going there for a stay in Lisboa!