Hello Mawlw, Yes storage in a small room can be tricky... If you have files and things... The last thing you want to do is have large pieces of furniture storing things... I would suggest putting a shelf all the way round the top of the wall but far enough from the ceiling height to allow for storing files etc... Paint the shelf white all the way around and even buy white files... Or boxes... that way you can store out of your eye view and still find what you need.. This free's up the space so you can make it appear bigger than it is... If the walls are not partition then you can add more weight just remember the raw plugs!!... Get really good brackets, Ikea do some lovely wooden ones No need to paint those.. I'd say 3 per shelf length of a m2 length & continue all round the walls to the window but not over unless there is the height above.... The other thing is that if you want a stylish office room. Get a good chair and you can get a table and shelf combo that leans up against the wall... See images... One of them is from Houzz! I love them both though... You get more floor space which in turn lends to a tranquil working environment... . : ))

How about painting the radiator and the wall it is on blackboard paint, having a gallery including your piece of graffiti art (I like it) on the wall on which the door is on. You can have a couch there or a daybed, whatever you want. Keep all the walls white except the one with blackboard, leave your curtains as black white and grey and paint your floor glossy white. Put a modern light as your main light. By having all these items in black whites and grey it means that it can change to another room at a later date easily. Have the wall shelves as you had them in your design, go for a white desk and have an orange chair. Have an extra large rug that has some black or grey. For the bookcase I suggest some closed in cupboards for items you don't want to see and some open shelves for items that can look pretty. I have collected a couple of pictures in an ideabook that are what my idea is based on. feel free to follow this link and look at them: http://www.houzz.com/ideabooks/50913056/thumbs/graffiti Love to see what you end up doing! :)

If you are thinking to tuck a chair under so that’s out of the way, I would perhaps go He length of a chair and just over, to give room to put things on the desk itself. I measured my standard minimal but comfy dining chair and that was 40cm excluding the backrest. So perhaps go 45cm wide? Also think about using a ‘leggy’ chair, just like in the photo so it doesn’t take much visual space.

I would go very modern and clean, you don't have to spend a lot of money. Painting the walls white would be a cheap and easy way to brighten the space. The add personality with accessories, art work and bedlinen. Have a look at our Ikea hacks https://www.thedesignerandthedecorator.co.uk/journal/diy-furniture Ikea Rast chest of drawers could make nice bedsides. Also for wardrobe, You could install an open hanging system from ikea like the photo below Or with a little bit of budget Sharps wardrobes could make a custom wardrobe around the bed And a lift up storage bed also helps with a small space