“Anyway, as I was saying —”
As I was saying returns to a point interrupted earlier. Adding Anyway makes the return to the topic clearer. After being interrupted by a question about heating, Tina goes back to discussing the pink walls.
A2-02 / CEFR A2 / EPISODE 02
Checking an apartment's features
SceneViewing an apartment with Tina, an agent, and Frank.

WORDS & CONTEXT
As I was saying returns to a point interrupted earlier. Adding Anyway makes the return to the topic clearer. After being interrupted by a question about heating, Tina goes back to discussing the pink walls.
Sleep on it means to wait until the next day before deciding, rather than literally sleep on something. It is useful when you do not want to decide immediately about a major purchase or contract.
Have other ideas means to think differently. Tina personifies her bank account: she likes the apartment, but her balance may disagree. The joke expresses concern about affording the rent.