Is At-Inn Trustworthy for Furnished Rentals?

I’m moving to Tokyo for a bit, and the best furnished options I’ve found for my timeframe are from this company: https://atinn.jp/en

Does anyone here have experience with them? Just want to be sure they’re legit and OK to deal with. I understand that furnished places targeted at foreign visitors likely aren’t the best possible deals, but that’s something I can tolerate. Thanks!