πικρὸν με ἀπαιτεῖς ἐνοίκιον → you ask too much of me, you demand a bitter rent from me
firmē: adv., v. firmus.
firmē¹⁴ (firmus), solidement, fortement, fermement : Cic. Fin. 1, 71 || firmius Plin. 35, 165 ; -issime Cic. Att. 10, 14, 3.