Autobús ETN Concept Niccolo v1.0

It appears that the "Autobús ETN Concept Niccolo ETS 2" you are referring to is likely a bus mod for the game Euro Truck Simulator 2 (ETS2), rather than a real-world bus model operated by ETN Turistar.

My previous search about ETN Turistar showed it as a luxury bus service in Mexico, but no specific bus model named "Concept Niccolo." However, the addition of "ETS 2" in your query strongly suggests a connection to the popular truck and bus simulation game.

One of the search results points to a YouTube video titled "MOD BUS - Busão TOP | Viagem com NICOLO NEW CONCEPT 2250 - YouTube," which further supports the idea of this being a user-created modification for the game.