Yes the reservations actually work. I had a reservation with Hostal LIS and I had no problem with the room. I did however, have a problem making my cancellation, even with a 24 hour notice, they still charged me for the room. Be careful, that regard. Once you get a response from the hostal/hotel, it should be easy to contact them directly.
Good Luck. It does take a couple of days for them to respond to your initial request, so be patient.
[This message has been edited by Amy25 (edited 04-02-2001).]
Contentment: the foremost wealth.