We were five and had an absolute wonderful time at Yavuz's beautiful brand new appartement. It is incredibly well placed in Istanbul (less than five minutes to the Blue Mosque and Hagía Sophía by walk). Yavuz was also a very caring host, who let us excellent tips about Istanbul in a useful recommandation book he made. He also helped us with our transportation from/to the airport for a very small fee. We highly recommand his flat.