It was a mixed bag of an experience. Here's my summary:
1. The host: we were only talking to the co-host, Mirjana. There was some misunderstanding about the time we were going to arrive, but instead of resolving it calmly the host was very agressive and rude. Also, we got a bit lost on the way there (first time in Milan) and were being constantly chased and reminded how bad we were for being late. So, the check-in was unpleasant to say the least.
2. Location: the area around the house is quite dirty, not the most pleasant suburban district. However, there is a shop right next to the house which is nice.
3. Connectivity: there is technically a bus that goes in the general direction of city center, however, it takes 33 min to get there, plus another 15-20 min walk if you want to reach Duomo.
4. The apartment itself is quite small. Would not recommend staying long for 3 people, but probably for 2 it would be fine. The kitchen area is in a niche, so only one person can have access to the fridge/stove/plates/etc. at a time. All kitchen appliances are present (no oven though).
The bathroom is well-furnished and the shower is super comfortable (best thing about the apartment).
The beds are fine but would not recommend sleeping on the sofa - it's very uncomfortable.
5. Check-out: we asked about flexibility regarding check-out hours but were told we have to leave at 10 am sharp.