Nike knew that she could have taken things further with Hades, demanding a good number of things for this "small" favour but it didn't have to always be that case for everything. It wasn't a huge request and something that she genuinely thought she might enjoy as well as helping out. Would she owe him later, yes? But it could be any number of things, none of which she could think of at the moment.
She smiled at him and hoped he was feeling better about asking her at all. She tried to be nice and friendly but didn't really know how to put people completely at ease if they were. Hence why she asked more questions so he could talk rather than ponder.
"Florence, oh I do love the city. I believe I am very available. Just send me the time and place and I'll be there on time," she replied to him. "I'm glad to help and have good company while I'm at it too." Se would have fun and enjoy herself, and then she would pull victory out and win, just like always.