I think it's lovely.
The navigation is easy, which is what users need. It has all the most important areas covered; treatments, prices, opening hours(which are really long... but good for you though!) and I love the idea of the Guestbook. See if you can get some of your current clients to make a few notes in there to get it going - I think that's a nice touch.
Also, I must say, I love the little twinkly bubbles, I think it makes it more animated and quirkly - different from others and probably more memorable whether visitors love the bubbles or hate them, i'm sure they'll remember them!
Could I also ask where you had your logo designed? It's really pretty.
Good luck to you. xx