Houses normally of 5 people, usually a modern detached house. Only exception would be those who stayed at Ashurst Lodge (google it) but that had a swimming pool!
Our house was a standard <10 yearold detached, mixture of single rooms and doubles with some ensuites. Neighbours were a mix but nobody from CTC lived near us. Some lived in Hamble, some in Ashurst and the others in the Eastleigh area. As far as I know, there are now a few houses in Hamble that CTC rent so that is probably the biggest concentration of cadets. Same deal in Bournemouth and Clearways/Peachgrove in New Zealand.