I stayed here for 8nights and I'm tellin you guys this place is amazing!!
Even if it's not so close to the JR station too much but it's not that far either.
I love this place because they provide everything you need in the room. Such as, Air-conditioner, hair dyer, wash machine, vacuum cleaner, sink,etc and also have shampoo, conditioner and liquid soap. Oh, in the restroom they provided you a small basin for you to wash your underwear too!!
The apartment is not that small like a hotel that I have been stayed before in tokyo. This one is quite perfect fit for me.
Thay have a pocket wifi for you while you stay here also or you can carry it with you anywhere why you are stay here! (very convenience and very safe your money for rental from the airport).
The bad thing is if you are not good in travel by japanese train before you might be confused about the transfer station or smt when you want to go here but just a first time, right :)
If I have a chance to go to Japan again I think I will choose this apartment ^^*