I'm spoiled being from California and getting good sushi there, and I haven't eaten a ton of sushi…read morehere in Toulouse.
The fish they have here is salmon and tuna, mostly in rolls, nigiri, and they have a chirashi bowl and a bowl with white rice and marinated salmon chunks. The selection of sushi boxes is not very big, and they are quite pricey at ~15€ per item. It seems like you can buy similar sushi boxes at Casino supermarket.
We had the bowl with white rice, avocado, and marinated cubes of salmon which was fine but nothing special. I've had similar sushi/fish at grocery stores without paying ~15-16€. The salmon was marinated in a soy sauce mixture and it was good and not salty. The sugar was also good sushi rice and a bit sweet - I'm sure they put mirin and sugar in there. The meal also comes with miso soup which was decent.
Overall, this was expensive for what you get, but I guess when there are not a ton of options, you can't be too picky. I would probably come back here again if I had a craving for sushi and it was convenient, but it wouldn't be my first pick for a sushi place. I can probably get something at Casino.