I have been using kwork.ru for more than a year and I have only the best impression. It's the best site for freelancers because it's really easy to use and it allows you to find the clients quickly. I also adore the 24/7 work of managers. They can help you to solve any problem. Also there is a clear system of payments and as a bonus they have got a nice referral system, which allows you to have some extra money.
Enjoy kwork.ru =)