Murray and Kay's Airstream is wonderful. The photographs are a great representation of the setting. The views are gorgeous and you're in close proximity to excellent hiking. As mentioned in the description, the shower and bathroom are tiny. However, they're quite usable. It helps to think of staying in this trailer as being akin to glamping rather than staying in a cabin.
A few recommendations for prospective guests:
1.) Do grab plenty of eats and wine at the wonderful Vintage Grocers in Malibu. While the drive to Malibu is totally doable, we found that staying at the trailer for meals was much more enjoyable than jumping back into the car for each meal. This trailer is off the beaten path, so going into town isn't exactly a five minute commute. But hey, that's part of the beauty of this experience. You're secluded!
2.) If you're flying into town, and there is rain in the forecast, rent a small SUV, preferably one with AWD. During our trip, it rained a lot (this is uncharacteristic of this region, btw). We initially had a small 4 Door sedan. We did make it to the top but as it continued to rain, it made for one wild ride (which added to the adventure)! The next day we switched our car out for free with Hertz for a small 4x4 and it made a HUGE difference in ability to go up and down the mountain. As a bonus, it sounds like Murray and Kay are more than willing to drive folks to the top in one of their vehicles, if necessary (if you plan to take this approach, do confirm with them beforehand!).
In conclusion: my wife and I look forward to coming back again. This was such a unique experience. Murray was very kind and enjoyable to talk with and we loved being in nature.