This is a great place for a couple to stay. The apartment itself is really comfortable and attractive. It was very easy to settle in. The kitchen was good, and the shower was fantastic. As others have noted, it was all extremely clean, and everything worked as it should.
The location is also terrific. Trastevere is a lot of fun. It's a bit touristy (for a reason), but it's far enough away from the center that it still feels like real life happens all around you. There are plenty of markets (indoor and out) and shopping, restaurants, and bars for any budget or preference - and that's just on the same street. It's a reasonable walk to most of the major sights and steps away from trams and busses.
We didn't really have to deal with the apartment owners. Except for one minor issue that they helped us clear up, we didn't need to contact them despite being there more than two weeks.
I would absolutely stay in this apartment next time in Rome. You should too.