well... that depends if you mind people sneaking up behind you or not while you are on the computer.
if you do not mind..
-flip it completely around and put it against the wall near the bed.
if you do mind..
-put it near the cubboard.
is your room really that small or are you just bad at drawing pictures? it looks like you would have to crawl over the bed to get into your chair
to give you more room in a small area... you could look into the bedframes which fold up against the wall when not in use. such as this https://www.google.com/search?q=flip+up+bedframe&espv=2&source=lnms&tbm=isch&sa=X&ei=CPTTU9KeGJDNsQT1roLIAQ&ved=0CAcQ_AUoAg&biw=1745&bih=890#q=murphy+bed&tbm=isch&imgdii=_ which would give you a more open feel to the room when not sleeping.
eduello... that diagram really only applies if you do not lock your door and are looking at inappropriate websites.