The X-Wave Umeda is surprisingly nice. It is actually more of a conference venue for seminars or business meetings, but it offers great rooms and service for travellers who have short-term accommodation needs.
The location is quite nice, about 10-15 minutes walk from the Umeda (梅田) stations (JR, subway, and all the other metro systems) or 5 minutes walk from the Ogimachi (扇町) station of the "subway" system. Within 5 minutes walk there are supermarket, drug/cosmetics store, convenience store, and a number of restaurants, so it serves well for basic living needs. It is also very close to a number of bars/night clubs, so it's easy to find a place for a drink or entertainment. It is also next to a number of hospitals, schools, and a nice big park, so you don't feel dangerous even if you come back very late.
The hotel is very new and clean, which makes you feel you can really relax. The service is also very nice, their staff could speak good English. Breakfast is also good, with both Japanese and western styles. In the room, they provide free LAN internet (and a cable) but unfortunately no wifi. However you could use free wifi in their lobby/publici internet area, where the wifi quality is very good.