Yes. The ladies at reception were very helpful.

Hello :) Just walk in and enjoy the service. You could pay for admission fare and other service charge such as meals or massage fee at once before leaving the SPA centre. Enjoy !

You could go to hotspring areas(onsen) or massage areas or rest areas whenever you like (could visit onsen many times). There are 2 restaurants in the building and therefore you could order ramen or foods in the centre. The food pricing is reasonable and value for money.

I believe you can stay overnight (they are open 24 hrs), but best to send them an email to check their terms haven’t changed. I was there in the afternoon only. I don’t think they have large luggage storage facilities other than hand luggage or small backpacks, but I guess it’s worth asking? Otherwise, maybe leave your left luggage at the station or airport?

As far as I am aware, females and males have separate bathing areas.

Unfortunately not. Their website only states that the entrance is limited to 5am to 8pm for kids "from Junior High (12 yo) to 18 yo", so I think it is safe to assume children under 12 are not allowed. For children of that age, I would recommand the "Ôedo onsen monogatari" in Odaiba.

You can purchase Cover Seal.Please request to frontstaff. S size or L Size 300 JPY.

You can choice nightwear.Please choice most large size.

yes, it is extremely professional and accommodating. It's not a place you would be afraid to trust the maagment, my personal experience is that generally speaking, the Japanese people are extremely honest. The courtesy is beyond compare and the respect for tourists is amazing.