The apartment has a good location, you can easily go everywhere in Sliema, to St. Julians etc. by foot. The neighbourhood feels safe and there's a nice little store that's open every day just a couple steps away from the apartment which is very, very convenient.
Raymond also seemed very kind and nice and was quick to respond to my messages.
Even though the apartment is located far away from the main streets, it gets quite noisy at night due to poor insulation (but I suspect poor insulation is a problem everywhere on Malta if you're used to the kind of insulation that's used in mainland Europe). I am a light sleeper and had my earplugs with me, but would still get woken up a couple times a night due to the noise coming up from the street.
The water pressure in the shower could be better but it was manageable.
The apartment was very clean.