Great location! I've always loved the Trastevere neighborhood, and this locale allowed us to enjoy it fully. The space is roomy (with lots of storage, if you're there for a long-term stay); comfortable bed (extra pillow/towel borrowed from the 2nd bedroom deeply appreciated!); bathroom a good size and the water pressure/hot water in the shower was great. Also appreciated was the washing machine with instructions, and a quick-wash cycle with cold water.
The kitchen is well-equipped for simple meals; the couch is comfortable; plenty of lighting in the living area (though no natural light in the apartment). The heating system is NOT independent (as listed), however, and we were chilled when home for the evening.
Aside from some minor repairs (a torn kitchen chair; mold in the bathroom; a loose electric socket plate; a shower door gap) and some minor aesthetic fixes (could use a paint refresh in places), I would recommend this apartment for it's locale, space, comfort, communication.