I would stay again there. Something to notice is not near the main attractions, however metro 5 and bus 28 are great routes, it goes to the core area of Madrid. From Canillejas, you only need to take metro five and can go arrive to real opera, gran via, royal palace, etc.
From Canillejas, you only need to take bus 200 (which has space for your luggages!!) to go from and to the airport, around 10 min to Terminal 4, which is the farest Terminal in Barajas.
Something to notice, is is how energy works in Spain, I live in Canada so this was new for me, it seems that they are energy limitations in place in the whole country, so when cook you need to mindful of it.
The apartment, is well locates, great internet I worked 1 month there and I highly recommend to stay there.
There is 2 supermarkets near by , convenience stores open everyday until late even sundays (around 2 and 5 min)walk from the unit, Fruit stores, bakeries, local restaurants and great transport. Really safe area.