We had a great stay.
The place is nice, tidy, clean. The bed is confortable, the couch that turns into a bed is fine.
It's extremely well located, in the heart of Lisbon and its nightlife neighbourhood but in a quiet street. Very convenient public transportations (metro, tram, train, ferry) are just a couple minutes away.
The Blue House staff is very friendly and helpful.
The only downside is that it gets really hot and it can make it a bit hard to sleep at night.