Ivan's place is really nice, clean, and right there, where you need to be while in San Sebastian.
The 3 things we enjoyed the most:
1.- Location: right next to the Plaza de Cataluña and a 300 m walk to the Zurriola beach. Also within walking distance from San Sebastian's old town with its bars and shopping
2.- Cleanness and decoration: the apartment was perfectly clean and I would say professionally decorated (or by someone with really good taste)
3.- High-tech: wifi access is done by simply scanning a QR code. As smooth as it gets and easier than in 99% of hotels or stays. TV with Netflix and other options, vacuum-cleaner robot (although a bit sloppy). A couple of USB ports.
The 3 things we enjoyed the least:
1.- Noise: not really on the hands of Ivan but the construction contractors really went for the thinnest walls and floors. You hear every person on the streets, every telenovela the neighbors are watching, and every step from above
2.- Layout: again, little for Ivan to do here. The master bedroom has no enclosed bathroom, but the other bedroom does, the second bathroom is right outside the secondary bedroom (which as said has an enclosed bathroom but no windows to the outside but to a common inside area). There is an 8 m aisle to get to the kitchen, the secondary bedroom, and the bathroom. The secondary bedroom's enclosed bathroom is huge and the other one is super tiny.
3.- Water pressure: the water in the showers has low pressure, even less when both run at the same time (for instance, a family of 4 wanting to shower after going to the beach). That was painful
All in all, we enjoyed our stay at Ivan's apartment very much, it's a nice place decorated with taste. You walk out of the door and you have everything you need: beach, bars, restaurants, groceries, shopping, etc. The thin walls and layout are probably at par with most places around, so you are paying for the location and the (relatively) large space. My perceived value for money would be medium-high.