Questions & Answers about В этом кафе готовят вкусно.
Russian often uses 3rd person plural to mean people in general or an unspecified group: they (here) cook well = the staff / the cooks / people at this place cook well.
So готовят вкусно is a natural way to say They cook tasty (food) here without naming who exactly.
В + a location meaning in/at usually takes the prepositional case.
So это → этом is prepositional singular (masculine/neuter), agreeing with кафе.