部屋代は

as for the room rent

→ 部屋代
phrase Rare #33,878
as for the room rent 部屋代 means “room rent” or “room fee,” and は marks it as the topic of the sentence.
JA: 部屋代は毎月いくらですか?
EN: How much is the room rent each month?

部屋代は決めたとおり

The rent is as agreed.

— エリート・スクワッド ブラジル特殊部隊BOPE (2010)

部屋代はいくらですか

How much is the rent?

部屋代は前金払ってください

Please pay the room charge in advance.

部屋代は言ったとおり

The rent is just as I told you.

— エリート・スクワッド ブラジル特殊部隊BOPE (2010)

部屋代はとても高い

The rent is very expensive.