This is such a centrally located place, you could throw a stone a hit the Clerigos clock tower and Livraria Lello. Everything was easy to walk to, Joana & her roommate Sophia gave me some fantastic local tips, and overall it was a comfortable stay.
Just a few things to mention if they are important for you as a traveller:
This is a great budget airbnb. The mattress on the bed needs replacing (it's quite soft/sinks), and the common areas aren't always spic & span clean, but Joana is really easygoing and friendly and the room is comfortable and they've put a lot of thought into the little details in the room itself.