Planning to come to Japan this summer.

The title says it all, i'm planning to stay for at least a month in Japan, Tokyo this summer.
I'm thinking of staying in Sakura Guesthouse, anyone got experiences with that?
I also want to aks if there are some do's and don'ts when i come for the 1st time to Japan. I also hope there are some people here who are living in Tokyo, understand a little english (and speak Japanese) and are willing to meet me there and like to guide me a bit through Tokyo and introduce me to the Japanese culture, in exchange for friendship, mine culture and the english, dutch or german language

thnx in advance for replying

"if there are some do's and don'ts"
yes

I am also planning to do this im going to yokohama for 6 weeks