The entrance to Maxos temple is through a (now unsealed) mountain passage to the north west of Lovis' tower. If you are not level 14 or 15 yet, you may want to complete the rest of Broken Valley first.
Do you have a save before giving the scrying stone to the priest? It is better to look into the stone yourself first (if the priest uses the scrying stone, you will miss an NPC that you can mindread for a stat point).
If you don't have an earlier save you can revert to without having to redo too much, then just enter the church in the village (the priest should have gone in after getting the scrying stone, if you have not looked in it yourself). Talking to a person in the church will give you access to the door at the base of Lovis' tower.
BTW, once you get in there, you can hit a couple switches and a button to lower several items hanging from the ceiling on chains; you can only choose one, but the obvious choices are not the best.
Four pieces of equipment will be immediately visible from where you lower the chains, but there is another chain on the opposite end of the room, blocked from direct view around a pillar or partial wall, with a skill book hanging from it.
