What did Lucy mean when she said "That’s just what I want"?

( L-Lucy, P - Peter, S - Susan)
   L:Oh, I am tired, Peter.
   P:Lucy, what about having a coffee?
   L:You are a clever boy. That’s just what I want. But I will not go to that horrid little cafe in Part Street.
   P:There’s a new cafe, just opened in the High Street. It looks very nice; here it is, "Susan’s Kitchen".
   L: Oh, this is nice. I do like those bright-coloured table-cloths and these fresh flowers on the table.
   P: Look, who is bringing in the coffee-cups. It’s Susan, who used to be with Mrs. Brown.
   S: Good afternoon, Sir. Good afternoon, Lucy. It’s nice of you to come to our cafe.
   L: Susan, you have furnished your cafe prettily. You must have worked very hard.
   S :Oh yes, we did work hard. Joe, my husband, fitted up the shelves and the electric lighting. But of course, you haven’t met my husband, Joe.
   L: But I have met him. He works at Bradshaw’s garage where I keep my car. He’s the best mechanic they have.
   S: Thank you. Joe will be very pleased when I tell him; and though I say it myself, he is a good mechanic. And now I want you to try our coffee. I think you’ ll like it.