Sounds good, do you have photos of the actual space you are referring to ?

A room divider would do nicely to separate the spaces.
We have a lot to choose from:
http://www.bargainbacker.com/Room-Dividers_c_27.html

Thanks for your comments, look photos of the space... sorry for the disorder, we are just moving in

More photos from other perspectives

We are going to change the black door from the right of the painting with a glass that goes to a little garden

I concur with cani, the space appears too tight for a room divider. Consider using furniture as a room divider, I.e., set the back of the couch to the dining area. If there is enough room place a library table behind the couch.

Love the divider in your picture!

Thank you so much... Just what I feared, the place is to tight for the idea. Is a shame :(

You can install a roller screen or a drape style divider.[houzz=][houzz=]

Your other options are................
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Your furniture should be against the walls in such a small space. You should consider switching the rooms around, the living space in the dining room, the dining room in the living space. Try switching the rooms and see how it works out for you. Let me know how it works out!

An open shelving unit would provide separation and additional storage, IKEA has some great ideas.

How about a partial height wall with spindles above?

If you put an area rug in each space, it would look a little bit "separate".

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