I'm calling about the flat-share. Is the room still available?

• This is something you might say if you are trying to rent somewhere to live.
• I'm calling about… this suggests that you are on the phone, but you could also say this after knocking on the door of the flat.
• If you are at the flat, you could also say 'I'm here about the flat-share.'
• Flat-share. Flat = apartment. A flat-share is when you share / live in a flat with others - probably strangers.
• Available - is the room still vacant / for rent?
• This is quite common in London, for example, where rent is very high.
• I'm calling: I am calling. This is the present continuous tense.
• You are calling right now.

This sentence is an example of houses, renting a flat, present continuous tense.