This place's menu is limited but interesting (within their limited range of making burgers), and…read morethe folks are friendly.
Like a lot of food in Portugal it's a bit low on flavor (to think all those Portuguese sailors traveled the world looking for spices...). I got the "spicy" 666 burger, but most bites weren't noticeably spicy in either sense (heat or flavor), though it did have more flavor than lots of other veg food in Porto.
The record store is pretty small and the restaurant is a pretty large part of the space -- though they do seem serious about the vinyl. To eat here you'll have to be okay with persistent punk/rock, though it's not loud (either that, or I'm deafer than I thought).