Beside the amazing location an incredible views from both balconies (perfect for a glass of wine) I would like to point out communication with the host.
Our different booked Airbnb in Porto got unexpectedly cancelled the day of our arrival, but we managed to check in within two hours very easily and without stressing in this lovely place and that was mainly thanks to quick responses and reaction we got from the host.
If you arrive by car, parking is really just behind corner, which is very convenient! As the penthouse is located on the top floor and there is no elevator in the building, you might consider this fact. But to climb those 5 floors (5 I guess...) was completely without any troubles. The view is worth it, trust me!
The only tiny problem we had was a struggle with the entrance door, which were little bit difficult to open. Firstly I thought I am putting incorrect code, but all it needed was a bigger push.
Definitely can recommend this place. (: