We are DVC members (OKW) but also love HH!!! Have stayed in 2 bedroom villas only but I think even a studio would not be cramped with the ages of your children. You will probably not be in the room much anyway. Very nice resort although the villas I have stayed in were a little past their prime (minor stuff but should have been fixed). Lots to do on the island...shopping, biking (our favorite thing!), great places to eat, etc. Your children will have lots of freedom as the HH resort area is self-contained and feels very safe to me. Your family can bike over to the beach (an under-highway tunnel makes this lots of fun!) and enjoy exploring the Palmetto Dunes area. Weather in APril should be o.k. Might be very warm or might be chilly..you just never know about temps that time of year... but the pool at the main resort area is heated (not sure about the Beach House pool as it seems to be open on a seasonal basis). We were at HH over New Years recently and it was probably 70 degrees! Gorgeous!!!!! Have fun!