Mobile cloud computing (MCC) is the most promising cloud solution for the future mobile environment. It aims to integrate mobile devices with cloud computing, and provide to mobile users an online access to unlimited cloud resources. Furthermore, MCC has changed the concept of mobile devices from primitive gadget to full computers that accommodate work, personal and mobility needs. Thus, in this paper we introduce a middleware that provides an intelligent behavior for selecting and adapting cloud services according to the current user's context. Besides, we propose a context-aware algorithm aiming to exploit location and preference cost of mobile user to select the adequate cloud resource.