23 months here.
Utter screeching chaos for a while, particularly while breastfeeding and pottytraining, but ultimately the best age gap we could have aimed for (not that we did).
I originally planned to have one, get it off to school, then tidily have another .....
If I could add one note of mild regret - we took loads of baby pics/kept mementoes of dd1, as expected, but with dd2, after the first month, all our energies went into keeping the little bandits clean, fed, and alive. For your own, and their, sake, make sure you carve out some special moments with DC2, particularly as the age gap means you'll be on your toes.
Now, our girls are great friends, but we're aware they gang up and scheme against us.