Martin is a fabulous and very communicative host. He arranged our taxi ride in from the airport. Within a minute of walking into the apartment Martin called on the apartment's phone to walk us through check in. Martin also sent us many suggestions for meals nearby and things to do in Madrid.
The room is located very close to a Metro station, grocery store, ATMs and other amenities. We only used the Metro to leave town; we found that the main attractions in central Madrid were within a 30-minute walk, only slightly hilly. Another great attraction was the cat that resides in the apartment courtyard, who would frequently greet our return.
The room itself was clean and well-equipped, including wine and coffee! There was a clearly written multilingual apartment guide. Things to pay attention to in the room:
The air conditioner and remote are in the bathroom, but the power switch is in the kitchen (and is labelled as such). If your AC doesn't turn on check the switch in the kitchen.
The light and fan in the bedroom is also controlled by the room light switch. If you have trouble with the remote, try hitting the light color button (circle with a K).
If someone sleeps on the sofa bed, you can unscrew the light bulb and allow the fan to continue to run.
Sometimes the water heater shuts off. There are clear instructions in the guide to reset the heater (in the cupboard above the kitchen sink.)
I will say again that the apartment guide is informative and Martin is rapidly responsive on WhatsApp. Even with the caveats above we give 5 stars.
I hope you enjoy your stay as much as we did!