Host Sam couldn't have been more accommodating; check in was frictionless, and the flat was spotless & well-equipped.
Location: being near the top of the Royal Mile puts you in easy reach of many attractions, and comes with tons of historical charm, but if you haven't been in Edinburgh before beware of the amount of steps.
And in busy tourist season you will have to battle some crowds to get in and out of the Close.
Nighttime noise wasn't bad - we heard a few drunks at closing time but they quickly dispersed. Generally the soundproofing was up to the task, and we never heard a peep from the neighbours thanks to the strong stone construction.
Local hits: we enjoyed the Real Mary Close tour of the understreet - an unvarnished picture of how grim life could be back in the 1600s-1700s.