...an open-minded intellectual guy exploring the world
Oleg is a polite and well-mannered guest. He has experienced visiting Japan a lot. I think even beginner Japanese host can invite him at ease.
He is politely!
My English is strange.
However, he made an effort to understand it.
After he left the room was still very clean.
I'm sorry. I regret that time to spend together was short．
When you came to Osaka once again, please be in my house for a longer time!
I would highly recommend him to be your guest any time.