The apartment is lovely, it looks just like the photos. I stayed five weeks and felt almost at if it was my home. Also, I found the bed extremly comfortable to sleep in.
We had a couple of technical hiccups, but Delia reacted immediately and was quick to resolve them.
Do consider that while the area is great if you want nightlife and many options for bars and restaurants right at hand, for the very same reason it is also not exactly quiet. If you're a light sleeper or noise sensitive, you may find it quite loud when the window is not closed. This is not in any way a fault of the apartment, just something to bear in mind when planning.
The building is safe, and there a multiple public transport options just a few meters away.
I would definitely recommend staying here, and would stay here again myself any time.