I'm not completly ignorant.. I have been going out with bike every sunday (30-35KM) with my MTB 2 years ago

Surfing on the Internet I found this (there are a lot of resellers here in italy) : http://www.createbikes.it/index.html Those bikes are sold for 399€ in your opinion are they good ?

Another question, I'm 175cm tall, which size should I buy ? 54cm ?