Sally's "flat"

But you must remember that two years ago the two main characters hadn’t met, which was surprising when you consider the proximity of Andrew’s cottage and Sally’s flat.

Does flat means “place” on that context? If correct, do we normally use ‘flat’ sometimes to represent the word “place”?

Flat is an apartment. I believe that the word is derived from it being all on one floor.

I also think that it’s more Brit English than American English, but most Americans would understand. (I’m American.)

Hey thanks man!

- Flat is an apartment. I believe that the word is derived from it being all on one floor.

I’m sure these senteces are correct. I just want to play with it a little bit. Is it also gramatically correct if I say “I believe that, that word is derived from it being all one floor.” there instead? Also should I had used that comma there after the first “that,”?

While it’s correct, most people avoid the that that construction. No comma.