There are definitely pros and cons to this spot. First of all, the location is very central. It's on a hill in a pedestrian zone with easy access to some great bars, restaurants, and the waterfront. The breakfast is great and on a beautiful terrace overlooking the Lisbon rooftops and sea. And the room was clean, big, and comfortable.
My main issue was how totally noisy it was. Each room has a door that looks out onto a terrace which acts as a very busy restaurant. So there are people laughing and drinking right outside the room. It closes at 1, but then there's a solid 30 minutes of cleaning and scraping chairs about and staff talking to each other and throwing glass bottles away. So we bought earplugs. The only other thing was that that room I saw on the air bnb website wasn't the room I actually ended up staying in. In fact this is kind of a hotel, so not exactly sure why it's in air bnb.
All of that aside, if you're looking for a place that's central, clean, and you're a deep sleeper, then this is the place for you!