Hi. You have a real issue that requires more attention. You might consider re-posting this in "design dilemma" as you are in "other" and that may get you more help.

Sorry but I've been looking and looking at your plan and I cannot see how you get into your apartment! I do see that the tv unit is quite far from your seating area which creates an off-balance room with all the furniture slid to the bottom half of the room. Please be more specific about your concern!

@Cornerstone design studio: Apologies for making big post; thought that more info will help. @Rupal ji, If it sounds like I dont need any changes; my apologies for that. Let me put it in short,"I am looking for options that give modern facilities without leaving good things from old charm/ comforts. " Thanks for the straight forward comments. I shall try to edit my original post to make it simpler and that looks open to new ideas.

Dear Ms. Priya, You could search for them on Houzz or any home improvement websites. Else you could custom build one by looking at the exsiting space. Normally an under stair area needs to incorporate deep shelves for proper storage and appropriate hardware is needed to create pull outs. Regards, Aurum Ideas + Spaces Bhubaneswar