We had an outstanding 10-day stay at Walstone Bothy. There were 4 of us older gents on a golf holiday (with tickets to the Open Championship!) and this was a perfect rental - great location, excellent space, and congenial hosts.
The photos and description are all accurate - the bothy has been renovated and is in tip-top condition, spotlessly clean, comfortable beds, and all the amenities you need are available. Lots of room for the 4 of us.
The location is great - in a rural area and very quiet, but close to the highways and airport, and only 30 minutes from Edinburgh and 1.5 hours from Glasgow (where the Open Championship was played).
The local village, Penicuik has lots of restos and pubs (we enjoyed having a beer or two with the locals at Narvaar House) minutes away. Our hosts, John and Kate, were easily reachable and helpful with advice, and immediately fixed a showerhead that fell off.
I've booked lots of VRBOs in Canada and the U.S., and this was one of the very best. Highly recommended for a great value stay near Edinburgh.