Best AirBNB experience I've had in years: superb location in the centre of Rome, but still very quiet. Apartment is in a very old building, but has been recently renovated to a very high standard: the best bed I've slept in in a long time, reliable heating/hot water, double glazing, beautifully designed, very fast wifi etc etc.
Check-in was easy/low-stress, and Marta very kindly helped accommodate us when I made a mistake with our arrival time. Will definitely stay again next time we're in Rome.