Hi Clare,
There are many different property management companies out there, so my advice would be to speak to other owners and go with personal recommendation. As the others have said, it's hard work to generate rentals at the moment, although I'm optimistic about the future when we have a commercial centre (fingers crossed as well). However you say you mainly want to rent to friends, and friends of friends, so if that's the case, you don't really need a management company to try and find rentals for you which as Hugh_man has said, doesn't happen much in the current climate anyway.
We have used 2 different companies - I would recommend both but they offer different services. If you want more info please pm me.
Jane