Gotten a few repairs done here, one of the cheapest I've found in general, and very straight. The downsides are that the shop is TINY and you often have to call in advance to find the right time to leave your bike in.
They replaced the worn cassette and chain which were slipping on my Dawes hybrid for €40 IIRC (that lovely bike was stolen a few weeks later though :/), on the spot as well.

I don't think they really do many "general" supplies though, since the shop is so small. Worth checking out!