The apartment was lovely, perfectly clean and exactly as on the pictures. We received plenty of tips for Lisbon in advance from the hosts but didn't communicate with them during our stay since everything was fine. The self check-in was easy and very convenient since we arrived in the middle of the night with a significant delay. The apartment is located centrally, although I cannot make any comment about the distance to various sightseeing points since we came for a wedding and did not do much sightseeing. The only (very small) downside is that the apartment has thin walls and you can hear neighbours in other flats or the hallway (not so much during the night but in the morning). It is not too bad but people sensitive to that should bring ear plugs. Otherwise, I totally recommend this beautiful flat.