a bedroom is 'une chambre' in French.
(bed)rooms - usually
a bedroom is 'une chambre' (fem.) in French.
'the bedroom is ..' translates as "la chambre est ..." in French.
a master bedroom
My bedroom is 'ma chambre' in French. This is a feminine noun, even when it's a boy's bedroom.
bedroom of the parents
the bedroom = "la chambre"
I'll assume that by room you mean bedroom; then it is "Dans ma chambre, j'ai...".
la chambre de ma soeur
The bedroom is 'la chambre' (fem.) in French.
My bedroom looks onto (the street, the garden, the back yard...).
A bathroom directly connected to a bedroom is often called an en-suite bathroom. Its use is primarily intended for the occupants of that bedroom only. In French the term "en-suite" literally means "a following", in this case referring to the bathroom being part of the bedroom to which it is attached. Found this in Wikipdeia's definition for bathroom.