This is a lovely spacious apartment with the metro right outside.
Few things to consider:
Lots of steps to get to the apartment once past the main door as the apartment is in the block behind. The lift is probably the smallest you will ever see so you will be walking up to the 2nd floor.
The apartment is really spacious, clean, with a fully equipped kitchen. the host was accomadating and communicated well.
The main bed is quite comfortable but not the firmest mattress. The sofa bed is better suited to children as not very firm.
The issues with the plumbing as mentioned were not as bad as we thought, although the smaller toilet did not always flush properly. The shower temperature did keep changing but we think the boiler needed switching on and off - then it seemed ok, although the power is not great. no strong sewage smell.
The location is good, the metro is handy or you could catch lots of buses from Termini which is only 5 minute walk.
Do not go to Picolo cafe on the left of the apartment as they will charge you extra for being a tourist...sigh. Try the Molino cafe 5 minute walk, near to the church, as they have excellent pizza- self service is the cheaper option. Enjoy!