We enjoyed our stay overall. The apartment was very new and clean, and the location was excellent for exploring Osaka, with plenty of shops, restaurants and transport nearby. The host was also very responsive whenever we had questions, and an issue we had with the hot water was resolved quickly. Having a washing machine, microwave, fridge and small kitchen made the stay much more practical, especially for a few nights.
The main downside was the size. We booked what was advertised as a quadruple room, but realistically it would be very cramped for four people, particularly with luggage. It felt better suited to two adults, or perhaps two adults with small children. The seating setup was also minimal, with only a small double chair and coffee table. A few practical extras would have improved things as well, such as drinking glasses and a tea towel. Communication was generally good, although instructions being split between Expedia messages and the OneStay app was slightly confusing at times.
Despite those issues, the apartment worked well as a clean and convenient base in a great part of Osaka, and we appreciated how quickly the host responded when needed.