Where is it? Im stealth based but would like to be able to level up my 1 handed and archery efficiently too since that stone gives 20% to all skills.

Should be in the spoiler section I think?

15% to all stats*

It is located East of Markarth, just north of Kolskeggr Mine.

The wiki lists all the stone locations:

http://www.uesp.net/wiki/Skyrim:Standing_Stones

Thanks, and ya i think it should be.. Honestly thought i was in spoiler section. Guess not!

The loverstone can be found north of Falkreath. You will run into a large lake and there will be an island in the center of the lake guarded by attacking fish that has the loverstone on it.

I think the locations is actually on the map since from the start... for some reason when i opened my map the location was there, even tough i was never around there, nor did i hear information on it from NPCs.