Martina's place is nice and the area of Via Tortona and of the Navigli is very lively and full of nice restaurants, bars and shops, meanwhile it is close to the city center. So from this perspective, the location is very good. It is though also pretty noisy and the window of the bedroom goes to the street with bars (even on Sunday night there was a lot going on) and to the railway station Porta Genova. As I was in Milan for a work trip, it was a bit tiring... I would just recommend to bring earplugs - then it's a really good place, from where to explore beautiful Milan.