My flat.

I live in Moscow (I have already mentioned this). But I didn't say where I lived. I live in five-storey, on second floor. In my flat 2 bedroom, 1 bathroom, 1 toilet and 1 kitchen. My flat isn't too big, but I have enough space.
That's all I wanted to say.

Hi,  in North America we usually use the word apartment and not flat.

I live in Moscow, as I mentioned before. In a five-story building, on a second floor. It's a 2 bedroom apartment plus bathroom, toilet, and kitchen. It isn't very big, but I have enough space.