Very good host, responsive, clear and always available. The place is nice and has everything a person could wish for, from very confortable beds to a full equipped kitchen.
The location is in a good position, we went to (almost) every part of Lisbon by foot from there but, if you prefer taking metro/buses, there are a lot of them very cloce to the apartment.
If I have to point out a little "downside", is that the apartment is pretty sensible to the noise coming from the other apartments of the same building: if you are lucky, you'll find good neighbours, otherwise this could bit a bit of a problem (but is not really a fault of the host or the apartment itself, I think that's a problem everywhere).
Overall perfect 10/10