Isa and Yumi's place far exceeded expectations! It was extremely close to the station and within 10-15 minutes walking distance of Asakusa's prime shopping areas and temples. There are also many accommodations very close by-- most importantly, ones that are open late for people dealing with the change in time zone!
The house was SO clean and comfortable. The common area was stocked with free tea and snacks, as well as any food appliance that you would need to use. The showers and bathrooms were also very clean and stocked with soap, shampoo, and conditioner. We stayed in the room with the bunk beds and that was more than enough space for our two bags each. There were also plenty of places to hang clothes and wet towels. The beds were so incredibly comfortable!
Perhaps most importantly, Isa and his family were very hospitable. I could come to Isa at any time and ask him for directions and how to get certain things-- he always had detailed answers for me. His wife also made soup for the entire house!
I would definitely recommend staying with Isa and Yumi if you have the opportunity!