For the record, my address for my last position at the UAM was:
Facultad de Ciencias C-V 505 Universidad Autónoma de Madrid C/ Fco. Tomás y Valiente 7 28049 Madrid Spain
It was easy to remember: it's all fives: C-V is the "modulo" in the building that, in the map below, is also labelled 5. 505 is the number of the office (despacho). Phone number was 2665 (extension).
Elena is still there, though, and her office is nearby that above.