Porta Romana is a lovely part of Milan. The San Lorenzo Basilica and the Fondazione Prada are both a walkable distance. There's good super markets around and the M3 is an incredibly useful metro line.
Beatrice was incredibly responsive and accommodating. The flat is perfect for a weekend away. Everything gets full marks. The building has a ton of character (beautiful stained glass and an old elevator that's very charming... if you're into that kind of thing). A great find!