Are daphnes easy to keep?
I have two of the very ordinary daphne odora. They must be at least 15 years old, if not older. One struggles a bit as it's in a container so it's never grown very big. The other is less restricted, it's about 24 inches high and 30 -36 inches wide. I've never done a thing to it... I would imagine that a bit of pruning every few years would keep it a bit smaller if that's what you wanted. I'm sure there are even better varieties available, mine is, as I said, very ordinary. But it's nice. I'm fond of it.
Wwmk2's suggestion is excellent; investigate varieties and sizes.
That hydrangea looks pretty good, too 