First, let's recount good things about this place. It has a fantastic view of Acropolis from a big private terrace and almost all the windows. The main attractions are within the walking distance and the subway is nearby. The company behind this flat is really efficient. All the requests we had were answered quickly and we got what we wanted properly. The cleaners that tidy up after each guest are quite good as well. The organizational side of things is being run very smoothly.

Second, there are small things which you may not expect from a flat like this. It certainly needs to be renovated, plus there are small but essential things that are missing. There are missing wooden parquet tiles with a rug thrown over to hide that. There are no hooks to hang a shower in either of the two bathrooms, so expect to perform some maneuvers. The bathrooms are clean but quite threadbare. There are written announcements both in the flat and even in the building elevator saying that nobody is allowed to drop used toilet paper in the toilet, but is expected to leave it in the trash bin nearby. The area around the flat is completely defaced with graffiti. There is a dumpster just outside the door, and do not be surprised if you see somebody standing next to it and urinating.
Additionally, there are a lot if things in the flat that may seem as if they are there because of some "design idea", but look more like as if they were brought en masse from a nearby flea market.

The things listed in the second part do not have to put you off necessarily. Depends on how relaxed or picky you are prepared to be.