Nice and clean B&B with nice staff. Someone from the staff even emailed me a few days before our arrival to check when we were coming and offered us another B&B for the first night when they found out that we were arriving in the middle of the night and InTrastevere is only open until 23:00. Really nice service!
Don't expect much of the breakfast though, but I guess that's normal for Rome.
The B&B is not situated in the centre of Trastevere but close to bus and tram stops and it is easy to walk anywhere in Rome.
If you like markets, there's a huge market just around the corner on Sundays, Porto Portese, open from 07-13.
Enjoy!