Fully spanish bilingual teacher has seventeen years of experience and runs an extremely smooth and happy school. There is one teacher's assistant (also native spanish speaker) who has been there for over three years. Consistent, loving and there is a perfect balance between skill development and free play. Families typically stay until kids are ready for kindergarten and there is low turn-over (they do not advertise and are usually full due to parent word-of-mouth).
The only problem (we very recently discovered) is that tuition rates are not published and may change on a whim (without people knowing). I believe they are now posting their fees for consistency.
Lots of rave reviews from parents over the years.