After staying at the Cosmo a few times, I've become very familiar with this bar. It's closest to the elevators when going to your rooms as well as the valet.
What I love about this place is how relaxing it is to be here, whether or not I've been alone or with a group. I've had waiters approach me when I'm seated at a table nearby and sometimes not, but either way, when I'm sitting away from the bar, I'm not really in the mood to drink. And usually, I'm waiting around, and you'll find that many other people seem like they are too. For that reason, it's comfortable enough to just wait it out for whatever or if you want to hang out with a drink or without. I've also seen several people order food.
Honestly, I can't comment on the drinks because I haven't ordered any but it's relaxing. It's slightly tucked away between the front desk and casino but I visit here every time just to get away for a little bit.