identify this tree?
Are the flowers nice an fragrant?
We think this looks like a type of mock orange shrub (Philadelphus).
They are old-fashioned shrubs that Thomas Jefferson planted in his gardens at Monticello.
Here is a page on it: https://plants.ces.ncsu.edu/plants/all/philadelphus-coronarius/
The best time to prune is roughly June-July after flowering as they bloom on wood made the previous season. You could renew this shrub over time by taking 1/3 of the oldest branches to the ground each year for three years.