We had a great time at Marcus' place! There's a pretty long driveway, so make sure you head all the way down to get to his homestead (it's also where the water and bathroom are, FYI!). He's got lots of space to spread out, and his place is just a short walk to the lake.
The neighbors have white cows, which are noisy in a cute farmsy way in the morning, and frankly, I thought they were adorable. If you get a chance to chat with Marcus and his family, they are super fun, really relaxed people, and were so excited to have my (very large! 15+ people) group come to stay with them.
You're also only about 15 minutes driving distance from the town of Ephrata, where there are gas stations and a Walmart. Moses Lake isn't too far away either, so it's very well located to be close but not too close to civilization in case you forget anything.