Right in the middle of the Gaslamp, I was initially worried that this place was going to be really noisy at night. However, that was not the case at all -- I was there for a week, including over a weekend, and the loft was very much insulated from street noise. Much quieter than expected!
The bed was a bit soft for me and I woke up stiff from sinking into the middle of it every morning, but aside from that this place is likely to be perfect for any trips that bring you to the convention center area.