Really adorable apartment in a quiet neighborhood just a short walk (or metro ride) away from the historic center. Check-in was very easy -- we had an early flight in to Porto so Ana's mother met us at the building and let us store our luggage until the apartment was ready. Ana was very quick to respond to all questions sent through the Airbnb app.
The space is very cozy and nicely decorated, with a separate bedroom downstairs and a loft bedroom above. The only downside is that privacy is a bit of an issue in this apartment if you're traveling with several people. Neither of the bedrooms are fully closed off -- if you stand in the loft area, you can see in to the bedroom below. The door on the bathroom in the loft is a sliding door, and it doesn't cover the entire bathroom area. So if you have two people staying in the loft bedroom together, they better be very comfortable with each other! All three of us ended up using the downstairs bathroom because there just wasn't enough privacy in the loft bathroom.
But that's a very minor issue. Overall, we very much enjoyed our stay at Ana's apartment in Porto and would recommend it!