Hey Bodis Robert here.
I have never modeled sofas and such,but i`m a Professional with over 5 years of experience.
Modeling a furniture,depends on its complexivity, i would charge like,100$ i guess
Now about the rendering,i really don`t know the price for it,because they are 500 different textures,and almost every second one needs a different wrapping style ,so it won`t look stupid. That is pretty time efficient.
I just started architectural renderings actually,and in 20 minutes,i got really high quality professional renderings, this i can show you in a chat,its my first ever architectural animation actually.
About worktime,if the payment is better then i expect,you have me 24/7
Best way to contact,here,facebook,skype , doesn`t matter.
Contact me,we come up with a proper price,term and sample
Best regards,
Bodis Robert