Which details in the first paragraph reflect the time setting of the Middle Ages?

Yes, your going to have to refer what your telling us in order to answer, we have no information at all

You can tell it's not modern at least, by the way Federico responds to the love he develops for Mona. She is not interested in his advances and what he does to show his love.

He

puts on parties and jousting tournaments cooks elaborate meals for large banquets. does not consult her about what he is doing and how he expresses his love. Her moral standards and her station in life forbids her from paying attention to such things.

The pattern is one based (sort of) on an idealized love called amour courtois or courtly love. The formula was very popular in the Middle ages.

This love is all one sided. It is male pursuing female and it is done in the very masculine way of the time. It usually involves a hopeless love.

We moderns do not believe in such tripe. We view success when both are "nuts" about each other. We might dream of courtly love for awhile, but our reality tells us that perhaps we should dream less and mutually pursue more and maybe that is even fanciful. But it is our pattern, not Federico's.