I have 6 penthouse style runs. 3 indoors, with windows to view the outside world and a T.V. to make them feel at home. Also 3 outdoors runs that you can see in the cattery link picture.
All are 6'High x 6' long x 4' wide, except for the family run which is 6'high x 9'long x 4'wide. Their bedrooms are 4' x 4' x 4' with a shelf to view out of the window, cat flap to outside shelf.
They have their food inside and their litter trays outside.
All are thermostatically heated by a radiator that is next to their beds for extra comfort. The temperature is kept between 15 deg and 22deg. They are insulated so as to keep them warm in winter and cool in summer.
Their food will be what you yourself feed them but with little treats such as fresh cooked fish, chicken etc.