That sounds a little too sketchy.
1. Holland has phones.
2. If there is a computer, there is a phone.
3. Three one hour lessons for a kid is way too much.
4. Who leaves their kid in an apartment while he worked on another continent?
5. If he has enough money to work non-profit in Holland and rent an apartment in the Boston area and pay for three, one hour lessons weekly for six months, why not get a professional piano teacher?