We liked that the apartment is a home (with plants, art and books) and not an investment property. The location is good, it's clean and everything you need is available (like tea, shampoo, towels and WiFi). Carmen is easy to communicate with.
One thing that would have been good to know up front is that there is a big building site across the apartment, which is causing construction noises during the day.
When it comes to value, I do feel that the price we've paid was too high. But unfortunately, everywhere in Madrid the prices for short term rental have been increasing massively over the last few years.