Casual babysitter for a 7-year-old Japanese boy

We are currently staying at a hotel in the Macquarie Park area and are looking for a babysitter to care for our 7-year-old son (a first grader in Japan) during the daytime on weekdays from March 10 to March 21. The hours would be approximately 9 AM to 5 PM, and care would take place in our hotel room or in a room of an office in Marsfield we are visiting.

His native language is Japanese, but it is not necessary for the babysitter to speak Japanese. He understands some English, and an English-only environment would be beneficial for him. Either my wife or I will be present in the room during the childcare period.

If you are available for any part of the above dates/times and can provide care for him, we would greatly appreciate it.