presume you used the search option on Manxnotebook for "Shakespeare House" and found MN for his brother at www.manxnotebook.com/mquart/mq09821.htm
judging from 2 directory entries it stands at the corner of Ballaquane road and Pevril road - if so I can see it as I write this - it is one of 4 large houses in a terrace (prob built 1880's ) designed for tourist trade