I lived there for 2 years. I studied Japanese, French and Spanish at university and I was already an advanced speaker when I went there for the first time. I had also had quite a few friends as well. I stayed in an all-male Japanese dormitory.
1 year in Tokyo as a student = study exchange via university. I stayed in an all-male Japanese dormitory that had about 300 Japanese students and 15 foreign students. The dormitory was an elite dormitory as well - it mirrored itself to Hogwarts and was somewhat Eton-esque... Students from elite universities like Tokyo University, Meiji University, Waseda University and Sophia University etc mostly occupied the residence.
1 year in both Tokyo and Sapporo as a full-time employee = worked for 9 months in Tokyo and then 3 months on a business trip in Sapporo.
What questions do you have exactly? Might be easier if you asked me specific questions in bullet points or something so I can answer what you're wanting to know.