<human>: Apologies if this is not the correct sub-reddit. 

Long Story short, I moved into a three bedroom apartment in december with two other randoms. The two of them are long time friends. The apartment was entirely furnished by them. And I am subleasing the most expensive room with attached bathroom from one of their brothers. 
 
The apartment has a full kitchen with sunroom, and a living room. They have their own rooms with a shared hallway bathroom. 

They are attempting to start a business. So they took it upon them selves to place desk's in the living room, re-paint the walls.As well as remove the couch that was there, and replace it with a new one. All without my consent. They even asked me to split this new couch with them. I said no, because I wasnt budgeting my self for a new expensive couch.

I viewed the living room as a shared room for the three of us. Some where I could go to entertain friends, or invite a date over. As opposed to just using my room. 

Now that they have taken over the space, I dont really get to use the room as much as I would like. Should I ask that since I no longer have free access to this space, that they cover it in rent cost? Because the way I see it, its basically not a room a i can use any more. So why should I be paying the most rent, for less than was expected upon signing the lease?

Provide a brief overview of the text.
<bot>: My roomates took over the living room and have no converted it, into their new offices. I cant use this room as it was intended any more. So can I or should I ask that they cover it in rent cost?