The cafe / club have 2 different areas. One for hall (indoor) where you can watch some performance in the stage and other is karaoke room. The hall is big enough for 1000 people maybe (CMIIW). The sound system and laser are really good. The sound system in the karaoke room is also very good. Just their song selection system isn't so nice.
http://www.indoholiday.com/2008/10/blue-eyes-cafe-at-genesis-hotel-spa.html