Karmen's place is awesome. Walking distance from Plaza España, Gran Vía and more great sights, it's location is top. We stayed there as a sort of "couple's retreat" in our last days in Spain, and for a young couple the place is fantastic. Yes, it's small, the bathroom sink is so tiny that some basic tasks become challenging, but in all it's very much worth it, very lovely indeed. Check in and out was really hassle-free and Karmen was a great host. Only reason for not giving 5 stars is that there was a planned power outage for maintanence that we weren't notified about and that had us spend one night in the dark, but in all it was a small detail that didn't spoil our stay at the least. Great place, recommend it to all, especially young couples or single travelers.