It's a beautifully restored 18th century townhouse with a mind blowing collection of Georgian furniture and clocks. One of which was apparently worth £750,000 when valued some years ago. Every piece had at least three different functions and numerous secret compartments - a vital requirement back in the days before password protected zip files and .htaccess controlled folders were available.
Take the time to visit if you are ever near York. One word of advice though; avoid visiting Fairfax House, the medieval Clifford's Tower and the nearby Cafe 31 in the same morning. All three are suffering from settlement and movement to some degree and there isn't a perfect right angle to be found anywhere. Result: dizzyness and mild nausea until you find some flat ground again.