This is the second year I've stayed with Manuela's apartment and enjoyed it just as much. The location (Via del Monte della Farina) is outstanding - close to Largo Argentina, the Ghetto, Campo de' Fiori - and all the other sites of central Rome are within walking distance. There is a great supermarket a few doors down the street. The building has an elevator, so you don't have to hike up after a long day of sightseeing.
The apartment is clean and everything (dishwasher, clothes washer, hobs) works perfectly, as described. Even the water pressure is quite good in the shower!
Manuela is a wonderful and thoughtful host, always leaving things like water, bread, jam, etc for guests. She is also always quick to respond and checks up to make sure you're doing well. I will absolutely stay with Manuela again!