This apartment is in a charming historical building. The living room has 3 sets of French doors that we kept open most of the time, letting in the cool September breeze. The entire space has plenty of natural light. There's no air conditioning, but the time of the year we visited (mid-September) was in the 70s - plenty comfortable for us! The beds were comfy, we didn't use the kitchen much, and everything in the bathroom worked as it should. Even though there was no television, we didn't miss it and enjoyed stepping out onto the wrap-around balcony and checking out the narrow surrounding alleyways.
The key to the shared public door to the building was a unique star shape that took some practice to figure out. You just have to make sure the key is inserted FULLY into the lock in order to engage it. Likewise, the key to the apartment itself was another unique piece of work - it extends and retracts with the push of small buttons. The hosts have a pretty good check-in process built into the AirBnb app that has pictures to help you out with using these unusual pieces.
We didn't really have much interaction with our hosts - the key was in a lock box and everything in the apartment was straighfoward or already documented in the check-in and apartment notes.
Porto was a beautiful, if not touristy place to visit, but we enjoyed our 3 days there. I'd recommend this apartment to anyone who doesn't mind a short walk though a couple of steep hills and enjoys rustic surroundings. I sure enjoyed it!