If you do not get replies on the EF or any other social networks in Switzerland, one of the advises that I often give to the people new to the Swiss tennis is to contact your local club. It's a bit too late now as the season is nearly over and the clubs will welcome new applications before May next year only. You can find some more details how it all works here:
http://www.englishforum.ch/sports-fi...ss-tennis.html You will find both kinds of people there, those who play competitive tennis throughout the season and also those who are recreational members just to hit once or twice a week for fun. I believe you belong to the latter group and just want to find few likeminded partners for regular session to improve your game.
If you already know where you would like to regularly play close to your location, good idea is to contact the local sport-centre with indoor tennis court. You might ask there at the reception desk where you could leave your contact details to find partner on the same level. You will be surprised there are many folks is similar shoes. Good luck!