I stayed here my first 2 nights in Tokyo. I booked it easily through the Japanese Inn Group:

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I took the Airport Limousine bus to the Shinagawa Prince hotel, crossed the street to the Shinagawa JR station, and then got off 2 stops later at the Gotonda JR station. The Ryokan was a very short walk from there.

Ryokan Sansuiso is an affordable choice (under US$50 per night - 4900 Yen) and the room was large enough. Toilets were western style. I had a lot of privacy. It was a very short walk to the Gotunda JR station and from there you could easily get around Tokyo. This is where I experiened my first Japanese bath and it was relaxing and simply wonderful. Yukata, slippers, tea and biscuits are provided. The futon, mattress and covers were thick and comfortable. There was air conditionning that I hardly used.

This Ryokan doesn't serve an meals but about a 3 minute walk away you can find a range of options, everything from noodle houses, Japanese cuisine at various price ranges and Korean food to Denny's. A variety of vending machines with hot and cold drinks are just steps away. (Leave the Ryokan and turn right...you can't miss them.)

The staff was friendly and helpful and some family members had a basic command of English.

There are stairs so it's not a good choice for people who have physical challenges.

There is some construction going on nearby where the bowling alley used to be but I wasn't even aware of it until after I had checked out and was walking to the station on my way to Kyoto. They clearly don't start very early or work very late into the evening.

This Ryokan is a good choice if you want an affordable alternative, that is clean, bright and conveniently located. You can even see the Japanese version of the Broadway production Cats. It's right around the corner. I have no hesitation in recommending it.