Onix is friendly, good welcoming and responsive.
Cons (-): Flat's decoration is pretty outdated, and furniture isn't corresponding to the price 180/night . In particular the dirty sofa has lots of stains, is very uncomfortable, it stinks, you just don't want to sit on it, not to say out of question for sleeping in it! Roof terrace is unusable (steep stair, no shading nor enough furniture nor pillows) and the other lacks outside pillows for the chairs. It could be possible to be hidden from neighbours direct view into the whole terrace and flat with some well-placed plants.
East-oriented bedroom windows don't have shutters, and inside curtains are too narrow, so you wake up every day at 4am, that's annoying.
Pros (+): The apartment is well equipped with everything you can need, one can see it has been used to live for real. Localization is central, restaurants, supermarket, quiet neighbourhood. Lots of natural light, and natural air. One of the terrace at the same level of the apartment is very appreciable.
All-in-one: OK for less than 100€/night or it should be fully renovated and refurbished. High-season cannot be the only reason to rise a price.