We stayed there as a family, 2 adults, 2 teens. Terrific location in the heart of things. A few minutes walk from Sol and Plaza Mayor. The nearest Metro station is a minute away. But if you are willing to walk a bit (a fun walk), the Sol Metro station has even better connections; We actually didn't use the Metro much, since everything was very walkable.
Instructions to access the apartment were clear. Shey had informed us - that internet access on your phone is necessary, to get into the apartment. This process worked very smoothly.
The apartment was exactly as described. It is very efficiently designed - ample closet space to empty your bags. Quiet and safe building. This seems to be in the Theater district - so there's a lot of night-time activity in the streets downstairs. So if you are a light sleeper, take some earplugs.
The windows have rolling shutters to keep the apartment dark and also curtains - if you need to sleep in.
Overall, it was memorable experience! Thank you!