I stayed at his place for about 10 days and it was such a lovely stay. William is knowledgeable so you can have interesting talks with him about brazilian society and culture in english, spanish, portugues or else! He is always willing to help you and he even invited me and my friend for dinner where he prepared one of the best meals I had in Brasil. :)
The location cannot be better. Close to the beach, metro station, bars and restaurants.
I already miss him and his cute persian cat Mia. :)