A nice shrine with attractive gardens surrounding it. I went early on a weekday morning (before 9am) and was one of the only people there. There are several nice photo spots here and there are no crowds like most of the other shrines. The flowers weren't in bloom in July but other peoples' photos from other times of the year look stunning.
I didn't know about this the first time I went to Tokyo, but came across it on this trip while looking for spots slightly off the usual tourist trails. Recommend a visit if you're nearby. It's walkable from Ueno.