Good location, super close to main attractions in the center.
Excellent communication, hosts super responsive and they even shared recommendations on things to do in Lisbon and restaurants.
Room exactly as described, clean, and with everything you need for a few nights stay. The only thing is that given that there are no windows, I had to leave open the small window that gives on the hall (otherwise it was too warm), so I could hear the noise when other guests were entering or leaving the Airbnb. But the issue was easily solved with ear plugs.
Overall, if you're planning to be out all day getting to know Lisbon, I do recommend this room for a solo traveller :)