I spend 10 nights at the appartamento MM/Piola.
It is, as mentioned earlier, very small, but if you don't spend too much time in the house and if you're not too tall/broad/long you should be fine ;) There is a tiny washing machine, a shower, a small kitchen (enough pots and plates, but just two glasses, 1 cup and very few cutlery, no wooden spoon, no dishcloths, no kettle, no coffeemaker, no bin in the kitchen), a small window with a nice view (on a clear day you can see the mountains). The bed is not that long. For me it was fine, but if you're taller than maybe 1,75m it might be too short for you. There is an elevator which works fine but is, too, very small. It should also be mentioned that there is wifi, but only 2GB a day.
Transport connections are great, there is two metro lines nearby, also many busses. It only took me about 40 minutes to get there from Milano-Linate airport; Milano centrale is not far and Duomo, Brera, Navigli etc. can be reached easily.
Alessandro and his colleague were very friendly and obliging. My plane was about 1,5 hours late which was no problem at all. Also, the washing machine was broken - the next day someone came to repair it. Thank you both for that! :)
Thus, communication was good - although some messages just remained unanswered, i.e. when I asked about an early check-out because of a train strike I never got an answer (which might have been a coincidence). Strangely they also told me it was not possible to give me a receipt for the paid visitor's tax (I've always received one travelling in Italy). Check-out was uncomplicated, though (I just left the keys in the appartment and left).
All in all, I'd recommend the place.