Eastgate House is an Elizabethan townhouse in Rochester, Kent, England. It is notable for its association with author Charles Dickens, featuring as Westgate in The Pickwick Papers and as the Nun's House in The Mystery of Edwin Drood.Now a Dickens Museum (not really... See Lata's comment!), the grounds of Eastgate House contain the Swiss chalet in which Dickens penned several of his novels.
It seems that a tunnel was built between the main house and the writing chalet... so the author avoided to get his shoes dirty when he passed from one place to another (?!).