Cultivar Chuck Hayes has semi-double white flowers in May and June and is reported to be more cold hardy than most. Miami Supreme has dark green foliage and fully double flowers. Variegata, the variegated form, is not supposed to be as cold-tolerant as the plain green. Mine has been perfectly hardy, but has not grown large enough to flower. Perhaps you don't have room for one of the large shrubs.
Many smaller forms are available.
The flowers are like those on the larger shrubs, only smaller. Some branches of the variegated form, Radicans Variegata, might revert to green and should be pruned off. Veitchii grows 2 to 4 feet high and 2 feet wide and flowers profusely. It has a single or daisy-form flower, with the same fragrance and evergreen quality. At 3 feet high, it is easier to use in a small garden.