This festival looks perfect! A week is what I like. It gives such a relaxed feeling. It's not that one needs to party hard since it'll be all over in a few hours again. I love such lengthy festivals very much. For me, it's like a true vacation. When interested to listen to music or dance, it's there around the corner. When not, all is good as well. It is just wonderful feeling to be in-the-moment for days, instead of just a few hours ;)
BTW, great you didn't have that much signal. The best experience is not taking any photos or videos at all, since somehow that distracts from the festival experience itself.