Very clean, comfortable and nice decor. It has everything you needed for a few days away from home (even a hairdryer which is really handy). Some nice little touches like water and beer in the fridge! The location is phenomenal; minutes from Sol, El Rastro, Plaza Santa Ana, Plaza Major etc.
There is very little natural light in the flat so perhaps not a good option if you are spending lots of time there. Not a problem if you're out and about though!
There was quite a lot of noise from a local bar on the Saturday night but this ended before 12pm. This is to be expected from any inner city block of flats; it's the trade-off for a central location but worth considering if you like to go to bed early ;)
The host was super helpful and easy to contact. All very smoothly managed. You can find cheaper deals out there but this is a great option.