a bit McDonalds like
May be it looks so on pictures, but in reality, it's very different. It's not about fast food, not about hamburgers and cola, it's purely about traditional Latvian meals (+beers and wines) and there is self-reception inside, you pay only on cashbox after you collect all meals you want on the plate.
Lido is the leading Latvian cuisine restaurant in Riga. Most likely you won't find any other popular place like this. All other restaurants are about non-traditional food. May be you may go inside small caffees and order some dishes there, but they won't be purely Latvian.