Sun and sea :) And also price. Greece, Croatia, Turkey etc were bloody expensive this summer. Odessa is just 3 hours by bus from Chisinau that has regular flights.
Odessa is normally home to a great club scene too. The "Ibiza" club is easily one of the best in the world, regularly attracts top DJs like Black Coffee.
The food scene isn't incredible, but pretty good for Eastern Europe. Dacha restaurant is excellent. The city itself is beautiful with heavy French vibes, and of course from an European point of view it's filled with very conventionally attractive people.