We recently stayed at Cristina's for 2 nights. There were three of us and it was perfect. Her apartment is located a block from the canals in Navigli where there's a lively night life. Her street is quiet as her apartment is in a courtyard. The apartment has all the amenities and seems to be recently renovated. The beds are comfortable. The only thing to be aware of is that the hot water runs out rather quickly when showering so space out your showers. Otherwise the location is 20 min walk from the Duomo or you can take the metro which is a quick 10 minute walk away. Cristina was a gracious and responsive host. I would recommend staying at Cristina's.