It's a very nice and spacious apartment at a central location of the city. The lock of the front door was a little bit tricky to handle, but with a calm hand and some patience it works just fine.
A lot of attractions can be reached on foot, but public transportation is also nearby.
Carlota was very kind and invited us to the bar, where she and Diogo are working. But unfortunately we didn't find the time. So, next time we go to Lisbon, we definitely will stay at Diogo and Carlotas apartment!