Fairly roomy for a cozy 1 bedroom cabin. Clean. Nice firm bed, small but comfy couch, and good-sized kitchen. Plenty of lights. My medium-sized dog and I had plenty of space. OK shower (could use a facelift), but may be difficult for taller people (the shower head is pretty low but is removable). Hot water came out of all taps almost immediately. The cabin is very close to the lake and pretty quiet for being near Big Bear Blvd. A few minutes' drive to trailheads for hiking and Big Bear Village for nightlife/eating. Keep in mind that the heater is in the living room--not sure how warm it will keep the bedroom in the dead of winter, although it looked like there was a space heater in the closet.
My big complaint: my last night in the cabin, I was woken up at 3am by loud scratching in the walls. Not sure if it was a squirrel or raccoon or what, but it was VERY loud and VERY persistent. Didn't think it was coming through the wall, but it was still disruptive. When I told the guy manning the desk at the rental office, he sort of just shrugged and then handed me a coupon, so I'm not sure if their critter problem will actually be taken care of any time soon.
Only other thing I would suggest is maybe some extension cords or surge protector bricks to charge devices -- there are very few outlets and they are in very inconvenient places.