I don't know anything about the Levo but this is my experience so far with YT.
Bought a Decoy CF Pro, rode it twice roughly 50km total- 2 weeks old, turned it on after charging realised there was an electrical fault, I'm a technical idiot so tried to contact YT, 1.30 mins on hold on the phone, no response, sent emails. Contacted Shimano who advised YT or Shimano Service Centre. After 24hrs and no response took it to Shimano Service Centre who couldn't fix the fault. Contacted YT again, on hold for an hour no response, email no response - 3 days later got a response, I explained situation also told them Shimano Service Centre offered to fix it for a fee, rather than send it back to Germany, YT weren't interested said send it back. 10 days of emailing YT and waiting days for a response, its finally gone back, on day 13. It's my second direct sales bike, the first was a Bird Aires great customer service, YT is abysmal, which is a shame because it's a lovely bike. I was close to requesting my money back due to poor service and I would never buy an E-bike other than from a lbs in the future. The German to English translation tool they use for emails isn't useful either as something seems to get lost in translation.
Other people have had better experiences, so could be a roll of the dice!