I reach Xian around 11:45pm, whats the best way to reach the Toyoo hotel from Airport?

You are advised to take shuttle bus Xishaomen Line and get off at Xishaomen Airport Business Hotel. The operating hours will until the last flight arrival. So you can catch it. The ticket fare is CNY 25 per person. Afterwards, take a taxi to your hotel. The cab fare is about CNY 15 at night.