I’m currently working on an office with cycles. All I have so far is the main room outline and the desk, but any comments and critiques you have are very much welcome. 
Looks good so far, though the desk is a bit thin and the render looks slightly grainy.
Thank you for all of your replies
Owldude- I am roughly basing my furniture from the designs seen here-http://www.carlhansen.com/index.php?id=3731 my desk did seem a bit thin compared to the designs so I’ve thickened up the top and legs.
I’m also not letting my pictures render for too long until I have come close to completing the scene right now-my computer takes it’s time with cycles
danilius-I’ve added more detail to the skirting board and will do more to the crown moulding as well-hopefully it has enough detail to add some interest to the scene, but to still keep the minimalist look.
Farmfield-I have subdivided my walls and added displacement- it isn’t very visible in this render, but once I have set up the lighting I hope to get that realism
Thanks for the advice, I’m now looking at adding more furniture to the scene, any more tips or critiques anyone have are once again welcome 
P.s. I didn’t mean to leave the material on the light as an emitter and I’m still trying to work out the best texture for the chair.