Michaela here from Roomle.
We are sorry seeing you leave.
You would need to manage your Apple Appstore subscriptions directly via the Appstore.
To cancel a subscription on desktop computers we suggest to follow this subscription: https://buy.itunes.apple.com/WebObjects/MZFinance.woa/wa/manageSubscriptions.
You are redirected to the iTunes Store where you get an overview of your subscriptions. You can edit and cancel your subscriptions there.
As an alternative you can cancel the subscription on iPad or iPhone. There are some more steps required. How to is described here: https://support.apple.com/HT202039.
We would really appreciate to let us know why you are cancelling your subscription with Roomle in order to further improve Roomle and its functionality.