First, you need to be 21+ to enter. The "legal" age in Poland is 18 ... but as everyone knows, almost noone asks for ID; so what do you get? Clubs and bars packed with 16 and 17 year old girls/guys. Czekolada is different, they check your ID at the door and let only of age people in ... which is good! Im 23 and I dont really like partying with kids.
As for the decor, I heard the club is very nicely outfitted: 2 main rooms, couches and a dancefloor.
Nice jeans and urban sneakers should be ok, but just dont look like a slob!









