How many days a week is he coming? If it is any less than 3 a week, I would also suggest that he come full time for a couple weeks. He will get to know you and your routine so much faster and easier.
If that isn't possible, just bear with it. In my experience, a full time child can take up to 4-6 weeks to settle in. A part timer can take months, especially if there is a big difference in schedules, etc between your house and home. You should start to see some sortmof improvement though, over that time.