We had a very pleasant experience staying at Sei's bnb. The apartment has all the amenities you will find in a home. The size of the apartment is perfect for a family/group of 4 pax. The bathroom may have a slight funky smell (at first) but does/will not affect your stay at all. The host was thoughtful enough to provide free use of some umbrellas to guests in case of sudden downpour (which we experienced during our brief stay). It's a good 10-12 mins walk to the nearest public transportation but there is a long stretch of ginza (shops) and restaurants nearby so in a way its somewhat an advantage .