The flat was just perfect for us as a couple. We spent a lovely 2 week holiday in Lisbon in this flat. It's in one of the most central locations possible in the heart of Alfama district. Very close to main landmarks and well connected as well. The hosts are very quick to respond to any questions.
The only tiny downside: Uber only goes up to a certain point and then you have to climb the rest of the hill (which takes about 3-4 minutes). But the beauty of the area makes you want to walk around anyway, so for us it was not an issue at all.