Overall our stay was quite enjoyable. Malta is amazing and has something for everyone. The apartment could be great for those for whom the comments below aren't important or when the host fixes the issues. The host company is great at communicating and fixing issues that came up (circuit breaker issues, a heater urgently required during colder weather months). The provided kitchen accessories (pots, pans, plates, utensils, etc.) were great and plentiful. The bedsheets and towels were clean and plentiful as well. The furniture is good and enough for full use of the apartment.
Issues in the apartment:
The noise levels in the apartment were unbearable. It is impossible to sleep in the far bedroom, as the window there comes out to the ground street level with cars directly outside of the window (within arms reach). This means that early in the morning during rush hour there's always a parking jam right outside the window creating extreme noise and a very strong smell of emissions. The window doesn't seal even a little bit with huge gaps all around, so the cold or wind will also come pretty much right through (only bad in the winter months, I guess). The same is true on the other side of the apartment, but not to the same extent as the sea view balcony is on the third floor, meaning you'll be a bit removed from the noise and emissions. In the winter months, be prepared to pay a lot for electricity (if it's not included in your stay) - electricity is extremely expensive and because of the inefficiencies of the windows and balcony you will be losing heat (in the winter) and cold (in the summer) rapidly. As opposed to what I was advised by the host, there is construction directly next door (on the other side of the wall), meaning that the renovation noises or drilling, hammering (sometimes violently and directly at your bedroom wall at 7:30am) are prevalent. The elevator is constantly out of service or doesn't go to the floor that you indicated (which I guess also means out of service). It's extremely unreliable. A special note for those with strollers - there are tons of stairs even to get to the elevator and with the elevator being out of the question frequently be prepared to carry stroller and infant/toddler in hand up to the third floor up a very narrow staircase.
Location:
The sea view is absolutely unbeatable - it's absolutely gorgeous and sitting on the balcony sipping a coffee watching the picturesque Spinola Bay is worth every penny. Saint Julian's is perfect for a party lifestyle with tons of clubs, bars, and restaurants around. Sliema (about a 10 minute walk away) is quieter and more family-friendly with terrific shopping, restaurants, and playgrounds.