The apartment has a great location. It is within walking distance of all the major attractions. There are also nearby trams that can take you close to attractions, but we were there for a week and only used the trams on a couple of occasions.
Trastevere itself is a fabulous part of the city, with an abundance of restaurants and bars at a range of price levels.
The apartment is spacious, and the kitchen is well equipped with good appliances. However, the photographs on the website are slightly misleading. Parts of the apartments are very tired looking e.g the covering of the leather sofa is starting to flake, the wooden furniture is very old and needs replaced.
The bathroom was clean, but the toilet u-bend was discoloured/brown and the shower door had rust at the bottom. The bathroom also had the only mirror; not ideal when using hairdryers etc.
The outside area was presentable, but got no sun exposure and has no outlook. We were there in October, so it may be different at other times.
This has the potential to be a superb apartment, but definitely needs a bit of an upgrade.