The owner of the 60-bedroom Georgian House hotel in London, creator of the so-called Wizard Chambers, has spent £35,000 on developing two more themed bedrooms.
The success of the first four Harry Potter-style rooms, which were first launched in 2013, has prompted owner Serena von der Heyde to expand the business.
Demand for the rooms was so high that the investment in their development was returned within the first four months.
Created by interior designer Diana Holmes, the new rooms have been designed to offer a more sophisticated feel, suitable for couples as well as families.
Guests pass through a "hidden bookcase" passageway to access the rooms, which were inspired by magic stories von der Heyde read to her children. They incorporate stained glass windows, gothic-style features, wood burners, pewter cookware and cauldrons, potion bottles and spell books, as well as four-poster beds draped with velvet curtains.
Von der Heyde, who is also the general manager and great-great granddaughter of the hotel's original builder in 1851, said: "The popularity of our Wizard Chambers has been incredible and we now have guests coming from all over the world to experience them.
"We have found that the revenue generated from each of the Wizard Chambers is almost three times more than that of one of our other boutique bedrooms.
She added that the hotel's occupancy rate and average room rate had risen to 91%, and 120% respectively, since the launch of the themed rooms.