Previously, I have given birth at Seibo and Sanno hospital and was a bit nervous to go to a new hospital.
The staff is excellent. Though I do speak Japanese, I asked the nurses how many on staff speak English and they said about 1/3.
My doctor, Dr. Sakamoto has been on vacation, so I'm at the mercy of the attending doctor, but so far so good.
If you are considering a hospital, I would highly recommend Aiiku. I will give you a full compare an contrast of the three "Dr. Sakamoto" hospitals at a later date.
For now, wish me luck!