A fantastic place to stay in Granada! The apartment was recently renovated, so everything is quite clean, quiet, and comfortable. Check-in was a breeze - there is an easy-to-use, automated panel outside of the apartments, so you don't have to wait for someone to come out with a key or check in at a desk. Just make sure you look for an e-mail a couple of days before your stay with a reference code to use it. Wi-fi and a simple breakfast is included, and they change the sheets/towels every 3 days. For us, it was also helpful to have a washing machine (we had been traveling for two weeks before arriving to Granada).
Note: our apartment had a few stairs (maybe 5) leading down from the door into the main living space. We didn't mind this, but if you have mobility issues, you may want to make sure to request one that does not have those steps.
Other note: their water heater has a smaller capacity than some may be used to, about long enough for a 10-12 minute shower (and about a 15-minute wait for it to heat back up again - they write this in a note). We didn't mind, but if you're into long, hot showers, this may be worth considering.
As for sites - it's about an 8-minute walk to Plaza Nueva and a 15-minute walk to La Alhambra (or you can take the nearby minibus up the hill). We loved staying with Nest Flats and would definitely would stay here again!