Saki is incredibly reliable with quick replies and detailed information in perfect English. We did not experience any inconviniences because of that and it was a very easy process, from the booking to check-in, all the way through to check-out.
The house itself was very nice with colorful touches, comfortable beds, big and fully functioning kitchen, clean shower and bathroom as well as a rooftop terrace with a superb view on Tokyo Skytree!
I can happily recmmond Saki as a host as well as this particular house if you plan to stay with a group of 6 (and probably even more) people!