The apartment is perfect for two people. There are not extra beds, but the apartment is quite large, with a fully functional kitchen and pleasant bathroom (nice view too)
It is in an excellent location, a few minutes walk to Brera, corso Garibaldi, castello sforzesco, and a still manageable walk to the galleria and duomo.
We were concerned about noise from the road below, but it was perfectly quiet.
Claudio gave us a clear and detailed introduction to the place, and great information (with map) about restaurants et al. in the vicinity. He was also very prompt in responding to emails and phone calls.