There is much involved with setting the stage before taking the pictures. Others have attempted to address this.
Your question is about photographing the apartment, much differant than preparing the site.
If indeed you follow Igor's direction of 'a bright and sunny day' you best need to know how to mitigate those images with a window in them. If you don't, you end up with a big white and bright square on a black background.
The nature of the question suggest to me you should hire someone to take the pics. Perhaps you can invest the manual laber to set the state propertly, yourself.
Contrary to popular opinion, I suggest being selective with the images published. Just becuse you can submit 25 images does not mean you MUST!. Serious buyers will call. Tire kickers will ask for picttures of the closets. What you do will determine with whom you will spend your time, energy and resources.... more