Hi Dimmy
Yes, both Maestro and Cirrus logos work in ATM's in Spain
I used my debit card which has both these symbols on.
If you do a search on the board, I think this has been talked about quite a lot, although not very recently if my memory serves me correctly.
Just don't do what I did and go without remembering your pin number! Trying to get money from a bank without a pin number is seriously difficult (as I suppose it should be). A passport was no help. The only place that would finally give me any money was the Caja Madrid, the huge one sort of round the back of El Corte Ingles off Puerto del Sol. (This particular incident was with a credit card, not a debit card).
But yes, your card with the Maestro symbol on will be fine.
Jo