Thanks! I managed to find the HI Madrid for lower, "starting from" prices: EUR 40 on 2-4-1 and EUR 52 on Green Room, compared with the normal EUR 64. The fine print is, of course, pre-payment and standard rooms will only hold 2 people, but I guess it can be easily solved with an e-mail to the hotel in good time before the stay.

First thing, though: wait until the new Pointbreaks, they might change my mind!