I had scheduled an 11:30 appointment but arrived at 11:15 and they were able to start me early (very convenient!). If you order through Treatwell they ask you to pull up the confirmation email so you can show the order number, then they look it up in their inbox. It's a bit of a faff but I guess that's how they manage things. The quality of my pedicure was great, and I was done in 45 min.
Great value for money and excellent standard of work. The ambience isn't anything special, but it's all about the final nail finish and the great price here. Would recommend.