Cost of sofa reupholstery (Istanbul)

I have a corner sofa in good condition (was only bought a year and half ago) but there are big stains all over. I tried to clean them myself but only made it worse. I will ask a specialised cleaning company to come and see if they can get rid of these stains but I am not sure it will work. I am thinking about having the sofa reupholstered in my own fabric as I would not mind a change of colour. However I am wondering about the price. Do you have any idea how much it costs on average to have a medium size corner sofa reupholstered? Do they make a good job? I live in Nisantasi but could bring the sofa in another area. If anyone can recommend a good upholsterer, that would be great. Thanks!