The photos do not do this place justice - it's even more beautiful! Bedrooms are big and both beds and couches are super comfortable. The kitchen is very handy and has everything you need if you'd like to cook dinner. If not, there is literally a restaurant underneath the building or just down the street next to La Sagrada. There's also a big supermarket a few doors down that came in very handy.
Safety wise, the building is perfect. Secure access to the foyer entrance and apartment on the 5th floor (with elevator).
I would definitely recommend this place and I would definitely return to when I revisit Barcelona.