Thank you, DonSimon, for info.
Well, I'm already in Porto. It is an amazing city. I'd like to quote TX on this - to me Porto is crazy like.
Unfortunately I couldn't bring my board due to airline restrictions, items larger than 50 centimeters aren't allowed on board and need to be transported as special luggage and required extra fee. As I am staying only for a week, I didn't want to bring a large luggage case, and nonetheless, the largest luggage case I could borrow didn't even fit a skateboard. Went to the skateshop, met the owner (I suppose), really cool guy, helpful, pointed all the spots in the map, also the DIY spot. Showed me some insta photos and videos of the place - blew my mind. Found out Porto doesn't have any good skateparks, they only skate street.
Tomorrow I'm planning tho visit Casa Da Musica, and maybe get to the spots at the beach.
Had the Francesinha yesterday for dinner. I had it at about 19:00, at 22:00 my stomach felt still full. I think I'll eat another one this week.
Anyway, I recommend anyone to visit Porto, it is an amazing city.