I was pleasantly surprised about how big the apartment was. But there was construction in the morning, so I couldn’t sleep in. And worst of all, the apartment ventilation was poor. As soon as I walked in, I could smell the humidity in the apartment and I got a bad cough, likely due to the humidity and mold in the walls which caused a small allergic reaction. To be clear, I could not see any mold, but I am allergic to all types of mold and dry dustmites and I started developing a bad cough. After my stay, I remained in Porto for about another 5 more days, stayed at a different apartment and my cough slowly went away. I hope they can figure out the ventilation, because it was other wise a nice place to be.