Are there any reliable online recommendations for local private guides in Xi 'an?

I don't think this is necessary, because in some cases, tour guides may be more reliable, which is a means used by some local people to work part-time, but sometimes you may meet swindlers or force you to shop. As a foreign tourist, in fact, you can't tell whether you are a local or not. Therefore, I personally think that if you go to Xi 'an to play, you should make preparations online in advance.