Never been to this particular hotel (I think AI is ruining the Island, but that's another thread), however, Cala'n Bosh is well liked and has lots going on for families, there is crazy golf, nice marina, a waterpark, beach is OK. I know many families who return year after year.
Make sure you go to Ciutadella (the old Capital), it's not far. Beautiful place. If you do get chance, hire a car for a couple of days and explore, there's so much more to Menorca than the main resorts.