My friend and me was staying there in the middle of May 2018. And we realy like this flat. The room is great, the bed is big, there 3 towels for a person, good wi-fi etc. There are all you need. The flat is on about the 4th floor, there is no lift but it wasn't a problrm for us. The window overlooks a quiet courtyard. And you could listen the birds singing at the mornings. Location is good, there are 3 metro lines near it, bus stations, cafes, restaurants, bars, sutermarkets. Marta is a great host! She helped us with advise from "what to try from portouguese food" to "how to get to somewhere". She is real helpful and very nice person.
I will recommend this place for my friends and will stay again when be in Lisbon.