hey jay, welcoem to the board.
i can only give you my opinion as someone who has worked with eureka in the past.
they are very professional and i have only heard good things about them, with the exception of their student housing ---> VERY EXPENSIVE as is that of most spanish schools here.
they have also grow a ton in the past few years since they moved up the street (c/ arenal) to a much bigger and more modern space.
i can also highly recommend
=elemadrid= and a handful of other schools.
take a look at
www.spanishinmadrid.com for a list of some of the better schools.
no matter where you end up studying, find a place to live on your own.
saludos & please keep us updated on your progress,
jer...