First things first: Enrica is a truly nice and welcoming host. She was extremely kind and accommodating with our arrival so top marks for that.
The apartment is exactly as described in the ad.
The location is very good for those arriving by train, or bus, or plane, as most people will be delivered to the monumental Milano Centrale, which is only a few minutes away.
The centre proper of Milan is only 15-25 minutes on foot, depending on where exactly you're going and your pace.
The apartment has been renovated and is confortable and well insulated from outside noise. It also has heating and aircon (we required neither during our stay), a washing machine, etc.
Enrica lives there so it is fully equipped to cope with everyday things - you only need to buy your food if you intend to cook.
The bedroom is locked because that's where Enrica keeps her - this is clearly explained on the ad.
The sofa-bed is of good quality and confortable, and the same can be said of the apartment in general. All high-quality and confortable.
An excellent choice for Milan. Totally recommended.