I've went Ziro many times during my vacation and I've loved my experience on visiting ziro each time. During winter the weather is quite cold and though to tour around but there are some benefits as well you get to eat lots of kiwi at cheap price and during summer it's actually best to visit ziro during summer. You can see beautiful steps fields and beautiful fish cultivated in the fields. During my last summer I've visited Siiro and it was awesome experience. I really enjoyed visiting it. Ziro is quite rich in cultures. Actually it's climate is similar to shillong. And roads are a bit troubling, roads isn't proper basically which I felt the only demerit.
Most important if you ever visit ziro, make sure to taste piike( traditional dish of Apatani) .