It's basically the non-Apple-branded Apple Store in Bremen, built very much like Apple's own retail…read morestores, only slightly more green. You get decent service, a good range of products (Macs, iPhones, iPads, iPods, obviously, but also accessories, software, and more) for the usual prices.
If you're looking to shop Apple, Gravis is the way to go in Bremen downtown! It's not quite Apple, but as close as it gets.