Take Route 9 North-bound to Exit 19, "Route 372, Cromwell, CT".
At the end of the exit, turn left onto Route 372 West.
Stay on Route 372 West, going through several traffic lights, passing the entrance to I-91 North-bound.
You will go under I-91 North-bound and South-bound, and past the entrance to I-91 South-bound.
At the next intersection, you'll see a Burger King on the right; turn right onto Sebethe Drive.
The Cromwell Courtyard by Marriott is at 4 Sebethe Drive, after the commuter parking lot, on the right-hand side.