This is great stuff, guys -- please keep them coming!
Postscript to my earlier post -- where I had to "return" a Spanish Groupon because the hotel restaurant wasn't going to be open on my arrival date (something I could have realized had I read the offer very carefully in Spanish). I'm happy to report that Groupon Spain fully refunded my purchase price. They seem to operate like Groupon USA, which also has a hassle free refund procedure. This is very good news as, we all know, things can sometimes go wrong with hotel vouchers. I now have more confidence in buying these foreign Groupons.