When I first went to Yoga One I was not very well versed/practiced in Yoga, but that didn't matter, the classes can be good for anyone at any level. I was surprised that they offer only hot yoga.
I found it to be not only a welcoming atmosphere but a very calming environment. The teachers all have there own styles but I have yet to have a negative experience with any of them and I have been back many times since my first experience.
For first time visitors to the studio they have special discounted rates, they also offer discounts for students. It is very easy to book a class (and pay for it) from their website.