Whenever I'm in the mood for some nail attention, I head to Polished South End. A big plus to me - lots of ventilation. I hate the smell of nail polish, to be honest. They have plenty of chairs. It looks to be very clean and trendy. If it isn't, they fake it very well!
The times I've been here, they get you in and out quickly. A minus - you have to leave the tip via check or cash. For me, that likely means that my nail tech isn't getting a tip unfortunately. Not sure why you can't add it on to your total.