This is well-decorated Airbnb in the middle of Lisbon's gorgeous Alfama district (one of the most touristy). We enjoyed our stay, but we wouldn't say it was perfect.
We always try to be positive about Airbnbs and try to give the full five stars if we can. Sadly, we can't here but mainly because the place wasn't cleaned when we arrived! We contacted the owner and it was sorted out fast and with an apology, but it was still really irritating for us after a long day of travel. The host did say this was the first time it had happened, so there's no reason to think it would again! Our other complaints are also mainly things to be wary of about staying in this part of old Lisbon, rather than specific to the flat. (1) Drains in Portugal aren't great, so expect a little smell in the apartment (we had this when we were in Porto, too). (2) Flats are really tightly packed in the Alfama, so you will hear your neighbours (we didn't mind this too much tho). Specific to this flat, our issues were. (1) The cleaning wasn't amazing – we found a few black hairs over the place. (2) The bathroom is really small and the shower has a drainage issue.
On the plus side, the flat is cosy and well decorated. The internet works well. The sofa is comfy and the location is really good for exploring downtown Lisbon. The hosts were also really quick to reply when we raised the issue about the cleaning, and messaged throughout to check that we were okay. Check-in was super easy to do.
Overall, we'd say this flat is a good spot if you want to see the most popular part of Lisbon. It's small and cosy with plenty of character. The hosts are also very communicative.