The studio is in The Lofts at Westinghouse complex.
If you are using a GPS, put in 99 Waterloo Street, Hyde Park. I know, I know, it is a little weird but it gets you to the right entrance to the Lofts at Westinghouse. When the gps says you have arrived, look around and you should see the guard shack and front entrance of 1 Westinghouse Plaza.
If you are coming down River Street, turn onto Neponset Valley Parkway and the entrance will be on the left.
If you are coming down Sprague Street, it will turn into Neponset Valley Parkway and the entrance to the Westinghouse Plaza will be straight in front of you.
Once inside 1 Westinghouse Plaza: