Well, overall, it was a really great place to stay. Of course there are some Cons but they are negligible, in the grand scheme of things.
The place was very modern, clean, and equipped with all the amenities one needs while staying in an airbnb. It is also in a very great location! Central and a walking distance to all the landmarks!
Both check in and check out was easy and very seamless. Just drop the key off in a mailbox on your way out, and you're all set!
Now the two minor cons:
1. The street noise is pretty loud from the apartment. Although not horrible, I can see this affecting some of the lighter sleepers. This is of course a double-edged sword, as this tends to happen when being in a busy centrally located area.
2. The apartment is at the very top of a few staircases, and no elevator. So if you have some heavy luggage, it won't be very fun. However, the hosts were gracious enough to help us with our luggage during check in. But, during check out, it was just myself, and had to constantly go up and down for the luggage, but that is no fault of the host, as this is quite normal in older European buildings.
Overall, I would recommend to anyone looking for a place to stay in Porto!