During our short Madrid visit, we were looking for a place to have a coffee and have some rest. The cafe fulfilled our needs in that sense. Some details:
Atmosphere: Quite nice, cosy
Menu: Simple foods (sandwich, tortilla, etc.) and drinks
Prices: Prices were average. We paid for a tortilla 2,5€ and for cappuccino something around 2€
Staff: They were kind but cannot speak English
All in all, nice cafe. If you are around, you can stop by.