I am an American student who studied abroad at Universidad Antonio de Nebrija and I had a very pleasant experience. The class sizes were small and one got to know their teachers well. The teachers were friendly and fairly lenient with the circumstances of being an international student. The program for international students was generally well-liked at the university.
Although the classroom atmosphere was more informal and relaxed, there was still opportunity to learn and, while at the University, my Spanish improved greatly. The program was nice because the classroom was conducive to learning as much (or as little) Spanish as each particular student preferred. I would recommend this University and their exchange program.
I would recommend Antonio de Nebrija University to a friend!