Amazing dog park. I take my frenchie here multiple days a week, and it's such a great experience. The park is clean, well maintained, and lots of friendly dogs.
As for the cleanliness, there's always poop bags stocked, the trash never smells, and the areas are clean and trash free. (Although some people throw their cigarette butts on the ground in the dog runs, which is extremely upsetting.)
I usually take Louis in the morning and there are always a bunch of really friendly dogs and owners. I took him in the evening once and it seems like there are a few more light run ins with unfriendly dogs. Nothing major though.
The park is separated into 35lbs and under small dog area and a large dog area. It seems like they cycle through areas. One is closed for maintenance and then two are open. So sometimes your area may switch. There's always lots of little containers of water spread around everywhere so if your dog is possessive, there really won't be much of a problem!
Definitely give this place a shot. It's pretty central and there are always dogs there, no matter the time of day or week.