Blue R.
Yelp
The website has conflicting information about the newest house, Ananda, so here is a complete description.
The original was too large so this has been shortened - see TripAdvisor for the FULL description.
Ananda house has three rooms: a bathroom, a living room, and a bedroom. The total size is about 50% larger than a typical hotel room. It has running water, including two sinks and a normal flush toilet. The room comes with a coffee maker, a tea kettle, and a large bottle of water (which I'm pretty sure is bottled tap water, which is pointless for this house).
Contrary to literally all the information on the website, it also comes with a small fridge. However it's barely cooler than room temperature (I believe it's a thermoelectric fridge), so I'm not sure how useful it'd be. The website says there's an ice box, but I couldn't find one. The fridge has a loud fan - it's much louder than our fridge at home, despite not having a compressor. I couldn't find any way to turn it off. I'd say it's about as loud as a normal box-fan on 'high'.
The living room has a mini-split, which doubles as both the heater and cooler. It worked well, heating the entire house in the morning and cooling it during the day quickly. It's actually slightly quieter than the fridge when running. There's also a (gas??) fireplace-stove in the corner of the living room, but we couldn't figure out how to work it.
The living room also has two moderately comfy chairs, with a single reading light. There's enough other lights that both people can read at night. There are plenty of electrical outlets around the house for charging things. We both had cell phone service (Verizon). There are two trees DIRECTLY outside the windows of the bedroom.
The only truly bad part of the experience, for me, was the bed. The bed uses a hard memory-foam mattress. Memory foam has a tendency to collapse under enough weight after several months of use. My wife, who normally doesn't like hard beds, thought it was extremely comfy, but since I'm a much larger guy, the foam collapsed for me, leading to EXTREME back pain after the first night. The second night I figured out I could sleep on a pile of pillows, which made it somewhat better, but still not great. This is the reason for the 4 stars instead of 5.
The treehouses are a LOT closer together than the website makes it seem. The closest treehouse is Burl, about 100 feet away, and the farthest treehouse is probably about 300-400 feet away. However the locations are designed so that you can't see into each others' windows, so privacy isn't an issue as long as you keep the windows closed when you're making lots of noise.
The treehouses form a circle around the central bathrooms. Shampoo, conditioner, and body wash are provided in the showers.
For handicap accessibility, I think only three of the treehouses appeared to be accessible to wheelchairs: Ananda, Burl, and Temple of the Blue Moon. The Ananda toilet had one of those metal bars to support yourself, but the shared bathrooms did not. There was a small bump getting into the showers which looked like it would be annoying, but the shower-heads were the handicap kind that can be picked up and moved around. There's lots of stone pathways so be ready for that.
Overall, aside from the bed we both really enjoyed the experience. I highly recommend this as a romantic getaway destination.