Nice place, very clean, fairly large space - close to restaurants and a small grocery store just down the hill. The host was very accommodating, they even went out of their way to help me with a small issue when I first arrived.
On a fairly quiet street, especially at night. One thing to keep in mind this is a traditional Lisbon apartment, so the windows are small and it doesn't get a ton of natural light. But I would definitely stay there again.