Very mixed bag, don't believe other reviews are totally accurate, so I will split this review's pros and cons by category.
Location and check-in:
Pros - very easy check-in and fairly convenient location, nearby to Porta Garibaldi train station and a number of Chinatown restaurants. The host is very nice and speaks both English and Italian.
Cons - located directly above a butchers. Whilst there is no smell inside the apartment, walking up to the apartment there is a particularly foul stench of meat between sunrise and sunset. Not a massive deal but not very nice either. Also, the key and lock is *extremely* stiff and there was little indication of how to open the door.
Main room:
Pros - good furniture and amenities including bed, table and chairs, washing machine, fridge, electric oven, large clothes storage, etc. The bed and covers were surprisingly comfortable.
Cons - the listing must have been made with masterful photography skills because the room looked almost completely different to the photos, despite being the same room. It was nowhere near as nice, as it was very dim and small, and there was a substantial amount of black mold (although not a dangerous amount). The fridge is very small/shallow and is atop a broken wooden pallet. Although there are many small kitchen amenities, e.g. pots, pans, and cutlery, they were all very dirty and not nice to use at all. Also, the kitchen tap water would not go cold no matter how long you left it on, it was always slightly tepid water.
Air conditioning:
Pros - despite what other reviews have said, we found the cooling abilities of the Aircon very effective. Just make sure to use the remote instead of the wall panel. Just to qualify this, we're British are therefore don't have Aircon at home.
Cons - no clue if this was just an "us" problem, but the Aircon seemed to dry out the air to such a degree that it caused our noses to become extremely congested. This may also be because of mold or dust caught in the fans, although this is just speculation. Do NOT use the Aircon if you have a somewhat sensitive nose like me, as I had to spend a large amount of Euros on medicines to deal with being constantly stuffed up.
Bathroom:
Pros - separate toilet and bidet was a nice surprise, and there are enough towels for two people, as well as a decent amount of storage for bathroom items.
Cons - the shower was absolutely dreadful. I don't think it shows up in the photos but it's essentially a tiny square with a shower head that doesn't stay up properly, either spraying the window or the floor outside the shower. To make matters worse, the water temperature was completely inconsistent, going from freezing cold to scalding hot every 15 seconds, no matter the temperature setting. Additionally, the bathroom storage was nearly completely full of other people's bathroom products, and there was barely any toilet roll stocked.
Summary:
Good location and has all the basic amenities, however definitely not worth the price we paid (£65 a night). Get a hotel a bit further from the centre and just use the metro or tram.