Our family of 4 stayed at Mimaru Tokyo Asakusa Station in May 2024 and it was a great experience. The room was a comfortable size, my kids (11 & 13) loved having their own space with the bunk beds, and having the seating area was great for when we wanted a low key morning eating breakfast in our room. The rooftop terrace had great views too of the Sumida-gawa, Tokyo SkyTree, the Asahi buildings, and the surrounding areas too.
This particular Mimaru is a little more out of the way, in terms of being on a Metro line (Ginza & Asakusa lines are very close), but not a JR line. It added a little extra travel time when we went somewhere, but not a whole lot and we were so close to Sensoji without being in the middle of all the chaos. The staff was super kind and helpful as well, offering various amenities if we needed them. I'd definitely stay here again & is a great option for a family with kids as hotel rooms in Japan with beds for 4 is a bit tricky. Mimaru is a great choice. Thanks for a lovely stay!