A great place in a very special spot. Some notes that may be helpful before you arrive:
Download Bolt! Uber is kind of a mess at the airport and Bolt is way better and drivers cant cancel on you and have you waiting, especially if you arrive late!
You do need a basic fitness level to comfortably get around the area as this is (I'm pretty sure) the highest point in Lisbon. Excess luggage will be a pain for a solo traveler.
Covid tests are easy to book ahead of time on the SYNLAB app ($25).
The hosts are easy going and the city is fun so enjoy!