This was a fun site, perfect for an overnight on our road trip out to Colorado. My dog had a lot of fun exploring (there are cacti, so watch out for those! We didn't encounter any snakes, but did see antelope). It feels like you're in the middle of nowhere (in a cool way). There is very little light pollution at night, and the land is open prairie. It has no wind breaks, so if it's forecast to be windy, it will feel very windy!
The dirt road to get onto the property was 1.4 miles from the highway exit (at least on our odometer). You don't need 4WD, but there is a significant dip between the gravel road and the dirt road, which might be difficult in certain vehicles. I'd recommend good clearance for driving farther than ~1/4 mile onto the property.
We had a perfect overnight here on our road trip to Colorado. We came in later than expected and didn't get to explore much, but Crystal was very welcoming and went above and beyond to make us comfortable. We went to the hot springs, which was nice on a cold/windy night. Outhouse was nice (it's not fully-equipped yet, but you can pee in it for now!), and my dog had the time of her life running around. :)
This is an incredible spot--centrally located to many incredible trails and just a few minutes' drive to downtown Leavenworth. The neighbors who own the lot next to this one have a donkey, a horse, two cows, and an older chocolate lab who came over to greet us (and a new puppy, who we caught a glimpse of in the car :). The mountain views are lovely, and you can hear coyotes, frogs, geese, and birds. There were deer that came into the field to graze at sunset (and the neighbors told us there can be elk as well, though we didn't see any).
Our dog LOVED it--she loves exploring and tromping through fields. FYI--you can't take dogs into the Enchantments, but we found plenty of similar hikes that allowed dogs. We ended up doing a day hike at Mt. Edna/Chatter Creek that was spectacular and not too far to drive. There's also a ranger station in downtown Leavenworth where I'm sure you can ask questions about specific things to do (they are closed on Sundays, so we didn't end up getting to utilize this, but good to know for the future!).
There are houses across the road, so the lot is not as secluded as other places we've camped previously (i.e. you may want to venture into town for going #2). If you are bringing a camp stove, I would also suggest bringing a table or something to elevate it. The grass wasn't super-dry this early in the summer, but brushfires are a definite concern.