Hello,
It will be a pleasure taking portraits of you two in Paris! The best time for taking portraits outside is towards the end of the day, during the last two or three hours of daylight, though we could get together any time: the morning, at night, during the week, the afternoon, on weekends, 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 in Photoshop or some other program.
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