check out http://www.insel-sports-club.de/
They have a very well organized house-league (it's not advertised at the homepage above as it is privately organized). You can join easily and then you'll have many different opponents. It costs 12 Euro a year which is a very small support to the organization team. It's a lot of fun. I'm playing there myself but I do not have much time to catch up with you right now. However, I can let you know when I'll be there next time to show you how it works.
If you're interested send me a pm with your email, I'll forward you the contact of the organizer.