I've never heard of juniper hops, sorry. But, I recently made an ale with juniper berries and it is outstanding, one of my favorites. I also used lemon peel, which goes very nicely with the juniper.
Not having a good idea about what amounts to use, I bought (at my lhbs) one package of juniper berries and one of dried lemon peel and used all of each, making a potion by soaking them in vodka for about four weeks. I used about a half a pint of vodka. I added the potion at bottling (at the same time I added the sugar solution).