You can never really know what experiences may have led to how a person deals with others. I think this host has had some negative experiences with gaijin. The location in Ebisu is good, the neighborhood is nice and calm, but still with things to do. It's a good location to explore Daikayama and Meguro from. The place is well-equipped and everything works well. Neighbors are quiet and respectful.
Things I wish I had known before, and reasons why I would not rebook: (1) the smell that others spoke of is much worse than expected. I could sometimes get it to go away by running water, but it is very unpleasant. (2) I did not like getting a 40-page manual that I had to read through and included many threats of fines. It was not helpful in the way that it was perhaps intended – the WiFi password and entry codes are buried deep in a document that must be downloaded. It's also tiny for such a high price and cleaning fee when there was hair (I shave my head) left everywhere!