The apartment was clean and very well structured, space is used very rationally and functionally, and as a couple with a 2-year-old child we spent a very comfortable week in it. There was a cot and a high chair, and even a stool for the kid to reach the washbasin: all very useful to avoid packing our own, and not common to find as an option in Italian rental apartments.
The owners are extremely welcoming and helpful: they welcomed us on our arrival with a basket of fresh lemons from their yard and spent quite some time showing us around both the apartment and the key services in the village. When we couldn't find a kitchen scale in the village shops, they were so kind as to bring and lend us their own for the whole stay!
The apartment is very centrally located within the village, a few minutes' walk from shops, bars, restaurants and the train station, and the terrace upstairs is very enjoyable.
Just a couple of warnings which apply to the whole of Monterosso and not this specific apartment:
1) If you are travelling by car, consider there is only a small expensive parking uphill from the village, which is also almost always full, so your best option is to leave the car much more uphill (white parking slots are ok, while yellow ones are for residents) and call a local taxi to pick you up and take you down to the main square for as little as 10-15 € (that is what you would pay for just a few hours in the parking if you were lucky enough to find a spot), and forget about the car for your whole stay since everything you need is easily reachable on foot and you can visit the nearby villages by train.
2) Be aware that the railway passes right through the center of the village, so you will hear trains pretty loud from pretty much everywhere in Monterosso.