OP, here are some photos I recently took of both ANA lounges and the RCC at NRT

Page 6 and 7 has photos of the ANA lounge at Satellite 5 (Gate 50s area, 4F)
Page 7 and 8 has photos of the RCC, including the shower amenities at the time I went (I GOT TRICKED!! I THOUGHT IT WAS H2O STUFF, IT WASN'T!!)
Page 8 and 9 has photos of the ANA lounge and shower at Satellite 3 (Gate 40s area, 2F)

I wouldn't advise going to the ANA lounge at Satellite 3 since it's at 2F, which means you really kinda have no view of the outside. The photo doesn't show it, but this lounge also has the free udon/soba.