The place itself overall was wonderful - bright and fairly spacious, fast enough Wi-Fi to work normally, and most of all - the most excellent location you could ever hope for for a few weeks in Lisbon. The bed was comfortable, there's good sunlight, and there are a few little balconies you can stand out on for a few minutes.
We did have a number of issues throughout our stay, including the front door lock, washing machine, and dishwasher all breaking, plus the AC making loud clicking sounds and the shower soaking the bathroom floor. Fortunately the team was extremely responsive, and proactively offered solutions to the biggest (lock/washing machine) problems.
I can't give the stay 5 stars because of the types and volume of issues we ran into, but overall the good outweighed the bad and we will have extremely happy memories of our time in this Airbnb.