When attempting to learn a foreign language there is no better way to do so than to immerse yourself in the language and culture that you are trying to learn about. Possibly the best way to do so is to have one to one English lessons with professional private tutors with experience teaching English as a foreign language.
Private lessons on a one to one basis will allow you to focus exactly on the help that you need to perfect your English language skills. Whereas sharing the lessons with other students may be a cheaper option, the teacher's attention will be divided between everyone in the room; in an hour lesson, you may find that only fifteen minutes is spent with you, resulting in a much slower learning pace.
Living with your teachers is one way to reduce the cost of one to one English lessons whilst also enabling you to experience the culture of native English speakers. Learning the language is hard, but it will be a lot easier if you are constantly surrounded by English speakers.
There are many other opportunities offered by teaching companies when learning English abroad, such as trips to local tourist attractions and experiencing the theatre, cinema or sport.
You should think carefully about whether you want to save some money and participate in a shared teaching experience, or get some concentrated quality education alone.