My experience at "Miraie" was amazing.
Now they already have tons of best rated comments so I would answer a question that I was wondering myself a lot: is it well situated?
First it's true that there is not a perfect spot in Tokyo but I would say that they are very close to a subway that is very helpful and bring you everywhere you need to go to visit the city directly and it's working with the JR pass.
Beside that, they were really friendly, the place is great and all the good things that you can read about them are accurate