Go to Western Watch Tower and start traveling to North from there don't go left or right just aim forward to North climb up on that mountain, at top of it there is Shrine of Mehrunes Dagon. In front of if there should be two daedras kill them and loot hearts also loot key, enter that shrine next to that Altar... inside there are two more, You can come back to this place once a week thats what respawn is, maybe a bit longer remember (you need to stay away from that shrine so mobs will respawn it works like "phasing" so if you are there and wait for 7 days it wont respawn. Basically you can farm hearts there.
Was nothing in front of the temple when I got there, but the statue was pretty awesome....you also need a key to get inside. I did however find a camp at the base of that mountian, some sort of group fighting foul creatures, there is a heart on the table inside the hall. All you need to is follow the steps down from the shrine, and look right at the bottom so you see the building. Oh you can only steal the heart.