Thanks Piamed and joebloggs.
we are planning to move to another house when I get there. Well, he is planning to move house by July to his friend's house. It is a lot cheaper and bigger than his current flat. Would there be any problems if ever he will move in to the new house by July and after I've submitted my visa application (planning to pass my app by 2nd week of June). Should he include that in his sponsorhip letter as well? Should be also include his new contract with the new house and acquire a permission from his new landlady? He wants to know if this would be OK or would have an effect on my application. He ofcourse doesn't want me to get denied but he doesn't want to let go of this new flat because it is cheaper, bigger and far better than his current flat.