I do not know if the OP is active so far, but the best way is to know people from localbitcoin & paxful and then trust them without using the site escrow "Its better to know them personally and do small transactions."
also, try social media networks "Facebook groups"
So I don't think the site you suggested will work.
This user is promoting/spamming this site in all of his posts.
check ---->
https://bitcointalk.org/index.php?action=profile;u=1163413;sa=showPosts-sinp-
I did not want to do an in-depth search of the site but based on this site
Cryptonex Disadvantages
Cryptonex supports only several payment methods, which are not very popular outside Russia: Advcash, PerfectMoney, and Payeer. Convenient ways to transfer money, such as bank wire transfer or credit cards, are not supported by this exchange, which is definitely a disadvantage.