Gosh, you had me worried there! Too many airports, too many hotels ...

But here you are:

http://www.booking.com/hotel/br/harb...rulhos.en.html

I was there in May, but although the harbor hotels chain still exists, they seem to have lost the GRU property.

Actually it wasn't all that great - tiny, tiny rooms - but it saved the hassle of transfers, it was cheap, and for one person and his cabin-baggage it was just fine.