I don't know if this relevant at this stage, as I'm relatively new, but after my first guest left I received a 'review them' message almost instantly. After my second guest, two days... and now I haven't recieved further ones. I'm not sure if it can just take some time or if this is now - a problem.
How long have you been waiting since your guest/s left?
Usually we receive the "review" email quickly, sometimes it has taken a couple days. I noticed a few hours ago when I was trying to add new pics to my listing the website kept freezing, or wouldn't let me get to page & a goofy guy cartoon comes up & says sorry, we having difficulty...
Hmm. I'm beginning to be more concerned over this so I've contacted Airbnb and am waiting to hear from them. Reviews are so important in these early stages.