Hey!^^
I went to Osaka so many times and I can tell you that is a very nice city to stay and have fun!
the Osaka city is amazing and you also can go to the Universal Studios ;)
I lived in Japan about 12 years and I love there!!!!!
missing Japan!!!
I hope you have fun^.^
You will have so much fun! My boyfriend and I went to Osaka last year. We spent two nights there and even took a train to Kyoto (I highly recommend going to Kyoto if you have time).
I'm originally from Okinawa, Japan, but moved to the States. Last year was my first time going to Osaka and it was waaaaaay too much fun! Enjoy, and have a safe trip! Let us know how it goes!