One possibility would be to swap the living room and the dining room. Since the current living room is larger than the current dining room you could still keep some comfortable seating (couch and upholstered chairs?) against the front wall for a keeping room/dining concept. Then your new dining areas (kitchen and dining room) and living areas (living and drawing room) would have good flow between them, which would work well both for family and entertaining. You could also add some builtin bookshelves in the drawing room or new living room to create a library area to add another fun element to the living areas. These bookshelves could be against the long walls in the drawing room, around the window with a window seat in the living room (former dining room), or built to create some separation in the open area between the drawing room and living room/stair area. Your plan seems to show some sort of builtin there, but I'm not sure what it is.

From what I understand the L shaped halls are both 18 feet in length. One L has an entrance door across from a window & opening to a balcony balcony and 3 bedroom doors staggered on both sides and the other L is connected to an open kitchen. The window-balcony area sounds beautiful and that is the focal point for that part of the hallway. These hall floors and walls are going to receive a lot of use and abuse from those going to & from bedrooms and kitchen. The flooring should be of good quality so it will stand up to the heavy traffic. Carpeting, hard wood, slate or tile: it's your choice but again quality is key. Carpeting in the hall helps decrease noise & is soft underfoot and I would choose carpeting. I like a plain color, with a pattern cut pile so it does not show wear and tear. I've had good luck with Stainmaster. I would train myself and family members to remove shoes & wear slippers in the house. This will help keep carpet clean. http://stainmaster.com/page/our-carpets/styles/pattern-cut-pile The walls will receive hard use, too, so they might be painted in a quality washable paint (eggshell?). Long halls can look a little tunnel-like: place a wall-art at the end of any long hall. The wall art at the end of the hall will seem to shorten the tunnel-effect and will make the hall more interesting. Choose a rather large piece of art that is bright and cheery. Here is a photo You could also buy a wall decal for the end of the hall: you place the decal on the wall and it also comes off with no residue. This decal is large bright and fun, but this company (& other decal companies) have many to choose from http://dalidecals.com/Framed-Wild-Flowers-Printed-Wall-Decals-Stickers-Graphics.html It seems people will be passing the bedrooms on the way to the kitchen quite often. If you're having guests, think of keeping the bedroom doors closed, in case the bedrooms are a mess. ;-)

How do you decorate your place, what kind of style, colors, and feelings? That will greatly influence the type of door you might want. Also, think of your budget, and whether you want to install it yourself or hire a professional (you don't need to tell us, just keep that in mind). Then look around Houzz, in the products page, they have lots of interior sliding doors and hinged ones, from elegant frosted glass in a dark wood frame, to rustic reclaimed wood planks. You may not want to purchase that exact model, but it might give you a better idea of what would fulfill your airflow needs without sacrificing style.

Mohammad. I understand your program. You may be lost in the details at the moment. Please do follow and trust the advice given here by all these people. You are about to embark on a reasonably expensive journey. Get professional help with someone who you can sit down at a table and brainstorm with them your ideas and intentions. There are Architects and there are professional building designers who are members of the American Institute of Building Design (AIBD) who are well versed in projects such as yours. I personally love a design challenge. After 38 years designing homes and special use buildings I enjoy this type of challenge the most. I am in Ohio and may not be close to where you are but I am sure with a little investigation you will find the best design professional for you.