B.M.
We like Children's Courtyard on Round Grove (3040) and Edmonds - I think it's the same one Christine is talking about. It's the Willow Grove Lab School, which means they serve as the training center for other Courtyards. Which means that they have some of the most experienced, well trained teachers in the system. It is definitely a learning environment. They are NAEYC certified too.
I have also heard good things about other Courtyards in Lewisville, and there are a few of them, so you should be able to find one that is convenient and to your liking.
Another one I've heard good things about is the Primrose School, it's further down Round Grove, between Valley Parkway and Old Orchard (just past the McDonalds.)