Hi Brunhilde
My parents have a villa in the south of France that they rent out and we truly believe it offers a home-from-home experience as we endeavour to provide everything.
We always provide a welcome pack which includes milk, water, juice, bread etc and there is always tea, coffee and sugar ready and waiting. More importantly, we provide a bottle of local wine for guests to ejoy after a long journey!
Ultimately, in terms of baby and children's equipment, my parent's villa has everything I ever had/wanted in my own home. Cots (travel and wooden as my youngest would NEVER sleep in a travel cot!), 2 pushchairs, carseats, bedguards, 2 x digital baby monitors, potty, nappy changing mat, highchair, bouncer chair, steriliser, toys, books, play equipment....
In fact, everything I can possible think of, they provide! So I definitely think the more you can offer, the better. It makes guests' lives SO much easier if they don't have to lug everything over from home.
We don't need blackout blinds/curtains as the villa has wooden shutters throughout so it stays dark even in the middle of the day!
Good luck!