-J-Hoppers Osaka
At the edge of Osaka's northern downtown(Kita), walkable from JR Osaka station(15 mins)
http://www.japan-guide.com/e/e4009.htmlTheir website
http://osaka.j-hoppers.com/e_accessmap.html
-Asahiplaza Capsule Inn
In the middle of Osaka's southern downtown(Minami), not walkable from JR Osaka, but still a good location for shopping, dining and night life.
http://www.japan-guide.com/e/e4001.html
Their website
http://www.asahiplaza.co.jp/capcel/english.html
To get to Aqualium, Spa world, and JR Shin-Osaka station(for Shinkansen to Tokyo), One hotel is as convenient as the other.