I've stayed at Randy's with a friend for a small weekend getaway at Madrid and have nothing but good things to say about his place.
First of all, the location is excellent! Randy's apartment is located in a really quiet neighborhood with a great vibe. We've felt secure walking around even late at night. There's 2 different subway stations within a 7min walk which is perfect and lets you save money on transportation. If you're travelling by car and need a place to park, there's plenty of spaces nearby and it's completely free.
The room is big enough for two people and has a big closet so you'll have plenty of space to store all your clothes if you're in Madrid for more than a couple of days.
The bathroom is huge and clean, as one should expect. The shower has great pressure and the hot water came nearly instantly.
We didn't see Randy much because we were almost never at home but he made himself readily available for any help we might need during our stay.
Overall, I'd recommend Randy's place for anyone who's looking for a great value for money apartment on a cool and quiet Madrid neighborhood. Next time I'm in Madrid I'll probably check if this room is available before searching for any other place!