Hi Masami,
I’m 6ft3 tall and I slept in the living room during my 4 days stay in your apartment because I wanted to give more space to my wife and 2 kids who slept in the bedroom so they will have better rest at night.
To my surprise not only did they slept soundly, I myself found out that your sofa bed was as comfortable and was able to cater to my height as well.
Your apartment is amazing and most importantly we had a good rest to rejuvenate as we walked a lot during the day.
Keep it up!!
Cheers,
KF