Natsu

how can u expect decent quality sushi for 2 Euro/roll? Unfortunately, good fish is expensive and the stuff you get at Natsu clearly shows your tastebuds why.
If you eat to be full, this might be your place.

But if you want Sushi that proudly carries the name, I'd recommend to walk up to the place at Burggasse and the corner of Kaiserstrasse (amazing other japanese dishes) or straight to the first district to Tenmaya.

perhaps not the supersuperbest makis i ever ate, but you can't go wrong at these prices. oh, and you always get a shot of sake while u wait.

i recommend the chirashi sushi (which is sashimi on a bed of rice with sesame.
big sushi set is ~6 euro.

Concerning the dangers of sushi: I have a very delicate tolerance threshold regarding fish and sea food, so I sent back the surimi (fake crab meat) sushi.

The rest was fine, we had tons of sake-sushi that tasted neither frozen nor off.

Edit: I just noticed that there are two Natsu restaurants, Gumpendorfer Straße 45 is the one where I ate. they share menus and advertising, so I presume they are very similar.