Rental property?

Hi, we purchased a 2nd home 2 months ago to move in to when we sell our primary residence (which has been on the market almost 1 year). Because our home has not sold, we rented it out for the 2016-2017 ski season(6 months). We did some necessary upgrades/repairs. We have only slept in the 2nd home for 2 nights. Can this be considered a rental for just 2016? It is very possible we will move in there permanently in May of 2017 if we sell our home.
How/do we have to declare the income if it not a rental property? We live in NH. Thanks!!!