Stayed here for 3 nights while we visited Yellowstone NP. It’s literally 5 minutes from the North park entrance, which was really convenient. The park is HUGE so you’ll do a lot of driving regardless, but it’s about an hour to hour and a half to Old faithful and the other geysers, just FYI.
The property was clean and had everything we needed. Gardener seems like a small town that got turned into a tourist location, so there’s a mix of residential homes and motels/lodges. It feels a little crowded but honestly we weren’t there often anyway so it was fine. Served it’s purpose well!