Diego is a super nice guy, my train was delay for 2 hours and he waited until 11:00pm for my check in. He was still patient to introduce the place and the attractions to me (thanks again :) )
The apartment is perfect, very clean, tidy and new which is exactly same as the photos. It's like a hip hotel which providing everything you need, for example, slipper, towel, shampoo, body lotion, still water...all is new for you.
The place is so comfortable, I felt like home every time when I came back.
The location is super cool too, you can reach at the central of Porto (most of the attractions) by walk in 5 mins, it's not necessary to take any transportation. It's also very convenient to take metro to the beach side.
Overall I'm fully satisfied with Diego's apartment, if anyone wanna travel to Porto, I would highly recommend this place to everyone.