I tried this one as I was passing through Luzern, didn’t find anything special about it, I’m giving the address just for the record:
Hirschengraben 19
6003 Luzern, Switzerland
The spaghetti carbonara (18.50 Swiss francs) is okay and pretty substantial (oops, sorry for the blurry picture):
but apart from that, the “all you can eat” salad buffet (re-oops, blurry again),
and the fisch Knusperli (19.50 Swiss francs with the salad),
didn’t seem to me much better than an average middle school canteen, save the fancy zig-zaggy sauce drawing on the plate. Bread was quite good; bottle of water with gas (4.30 Swiss francs).
The waiters we saw didn’t understand or speak much English, worth noting as well.