Last May I went to Europe. I've been to London, Paris, Rome, Assisi and Flourence. The best place was Flourence; worst = Paris. I fucking hated the people, I fucking hated how dirty the city was. It's not that interesting unless you went to the Louvre... But even in there you run into some really fucked up people but then again, a blonde 16 year old girl alone in Europe isn't the same as an older man...
I don't know if this'll help but I used EF Tours, granted I was with my school's Jazz Band.
I actually don't even know if it servers anything BUT schools... but hey, I tried.
Next year we're off to Germany, Greece and Spain. :)