I have the sister of that bike, the Masi Speciale Commuter. I think the only difference was the brakes. I am 5' 8" and I ride the 56. I had the 53 for a year and it was just too small. The 56 has a 55.5 top tube, so not really a 56. I loved this bike so much I bought a second one. Of all the bikes I have owned and I have owned many, this is the nicest bike I have ever had.

I did see the bike you are looking at and I think it is a great bike, if it fits it would be a great acquisition. I think the Masi's are quite undervalued right now. They have great steel frames and it is amazing how comfortable the bike is. I wouldn't have any hesitation buying that bike.