This may be the "entry level" Bianchi but the Via Nirone 7 is very well respected in Bianchi circles. It is said to be a very good, comfortable ride and a lot of owners prefer it to their more expensive carbon bikes. As others have said, I believe Campag Xenon to be their entry level groupset but this should not detract from the quality of the bike. If, assuming the frame is in good, straight condition, and it is the correct size for you, there is no reason not to get it at £350. If you wanted to, you could always upgrade the groupset to the latest Shimano 105 for around £400 which would make it a great bike. You could also take a look on the Bianchi owners club FB pages for more guidance - but you would have to join the group.
Good luck!