Hey targetpk, jer here. First of all, welcome to the message board buddy.
Well, on a normal forum, this would be a tall order but it just so happens that this is the ultimate Spain message board so I think I got ya covered.
Check with Antonio Alay of "Alay Studio". Last I spoke to him the other day he was willing to rent his facilities and/or equipment by hour, day, etc... He has a very cool dungeon type studio right off Gran V�a near the Banco de Espa�a (pretty central).
The studio is at C/ Libertad n� 15
His e-mail is alaystudio@jazzfree.com
Tel.: (+34) 91 532 5811
He is Spanish but speaks nearly fluent English. Just tell him Jeremy sent you
Obviously the rental rates are to be negotiated between the two of you.
Saludos and "suerte" ("good luck")
jer...