Greta's place was great, the appartement is very convenient, rooms are very spacious, and terrasse is perfect for cosy breakfast in the morning.
Whilst we didn't actually meet Greta, contact via internet was great. Her mother welcomed us at the flat was delightful, and very cool while she waited for us until midnight when our train (Thello, not to be recommended...) was very late...
Location was perfect for us, not too far from historic center, and right next to the lively bars and restaurants of the Navigli area...
A highly recommended place!