Hello,
It will be my pleasure taking portraits of you in Paris! The best time is towards the end of the day, during the last hour or two of daylight, though we could get together any time: the morning, at night, as you wish.
I could bring you the pictures on a USB key the next day, or I could make the photos available to you through a web service and send you the link by e-mail so you could download them at your leisure.
I have a Nikon D600, which takes Very Sharp pictures at 24 megapixels, suitable for printing at sizes up to 16x20 inches, and far beyond if the resolution is upsampled.
Please don't hesitate to ask further questions, and do keep me posted as your travel plans to Paris take shape...
Very truly yours,
David