Hello feklo budget travelers. Heading to both Paris and Madrid later this month and need some advice. Can we do this trip for 50€ per day, excluding lodging and travel between cities?

2 adults and 2 teen girls are in the party. We will be in Paris for 5 days and Madrid for 5 days. We are staying slightly out of the city center but meters away from metro stations both cities. Really want to try and keep the trip to the 50€ per day for all of us if possible. Thoughts on how doable this is going to be? In MAD we will have breakfast at the hotel, we won't in Paris.

Thanks for suggestions and insight ahead of time.

J