Making a room acoustically tolerable for a mixing hobbyist.

I am a hobbyist who wants to practise on mixing and of course just enjoy listening to music. I just moved to a new two room appartment and I guess that something needs to be done to the acoustics to be able to actually mix something. Im not looking for any complete acoustic treatment, just some help for the biggest problems (with a low budget, under 300$) so the acoustics would turn from horrible to somehow tolerable. My mixing levels will be low, because I don't want to invest on sound proofing neither distract my neighbours too much. Here is an in scale sketch of the room: The ceiling is concrete and I guess the floor is some kind of plastic. No carpets on the floor. It is at the same time a living room and a kitchen so that surely puts many limitations to what can be done. I don't have the ability to describe the acoustics very precisely, all I can say is that the room sounds a bit boomy and maybe muddy. The music sounds quite undefined. I was thinking I could have these in every upper corner of the room. And I'd anyway need some platform to lift my home theatre speakers on, so I was thinking I could maybe use these cubes for that. Do those ideas make any sense, and if not, what would you suggest instead?

If your budget is $300, you may want to build your own bass traps and put them in the corners of the room. Most folks also put bass traps or thinner traps on the first replection points between the speakers and your ears. If you search this site you'll find threads where a lot of folks have built their own bass traps.

Well I could get those traps I suggested with less than 300$, and Im not sure if I got room for more traps.. :( And if I understand right, the first reflection points locate at the window (which goes about from floor to ceiling) and at the kitchen wall (which has closets, sink and so on), so there is no way to treat those. Is there something I should concider putting on the wall behing speakers or behind the tv?

Maybe the biggest issue is that this is a square room. And then you have all those hard reflective areas, e.g. cabinets, table tops, television screens, etc that will give more surface area for sound to bounce off of. One thing that could be beneficial would be to develop an overhead cloud to reduce the action, at least, directly over your head, which may help in getting a better translating mix. The parallel boundaries (the walls) could benefit by installing broad band panels at the mid point of the wall in effort to minimize flutter echo and the square rooms potential to multiply the problem.