Oskar is a very nice person who was extremely responsive to all of our questions. He lives right around the corner so he met us as soon as we arrived. He allowed us to check in 2 hours early, which was much appreciated as we had just landed from North America early in the morning.
The area is not particularly interesting but the metro is a 10 minute walk away to all Madrid attractions.
The kitchen appliances were easy to use but if I could offer feedback, it would be to leave some basic condiments like salt, pepper, oil & vinegar and a few other things to make cooking on arrival simpler.
My only mild complaint was that it is quite dark in the appartment, it has few lights of low wattage, the kitchen in particular. That being said, I recognise I live in a place with relatively inexpensive and completely clean electricity/energy.
Overall: Very satisfied.