My girlfriend an I had a really nice stay in the flat. It was very clean and modern including everything you need for a pleasant stay in Lissabon. It's perfectly located in one of the nicest areas of the town, close to many many restaurants and bars and also just a 2 minutes foot walk to the city center and all the public transportation. Google maps somehow had problems to guide us to the exact adress and we wandered around for half an our till we finally found it. In the night it's a bit noisy and the rooms smell a little bit moist but these are really really small downsides on a generally perfect location for your lissabon stay.
The hosts were easy to contact and very friendly and helpful. Thank you for everything!