Combination microwave/fan ovens are superb. The time to cook poultry/beef/pork etc. are cut down enormously and meat left with a crispy skin.
Suggest you go and see one of these ovens at a retail outlet so that you can see the size.
My suggestion is a Toshiba make if available. Had one for sixteen years before it died. Have a Sharp model now but the turntable is knackered after 18 months use.