It is not only Avast, Bitdefender TrafficLight is also blocking this website.
The malicious history of the IP address: http://cyberwarzone.com/malicious-history-of-198-49-23-145/
Reasons why 198.49.23.145 is listed on Cyberwarzone:

History of being on a blacklist History of being used in an aggressive marketing campaign History of malicious traffic or use Triggered as a spam-bot or aggressive crawler We were lazy and we did not see that it is a false-positive

Also consider: https://www.virustotal.com/en-gb/ip-address/198.49.23.145/information/
See: http://www.dnsinspect.com/artursadlos.com/1434391068
WARNING: MX records duplicates (same IP address):
188.121.52.56: [mailstore1.europe.secureserver.net. smtp.europe.secureserver.net.]
Although technically valid, duplicate MX records have no benefits and can cause confusion.
See: http://toolbar.netcraft.com/site_report?url=http%3A%2F%2Fwww.artursadlos.com%2F

Please check this list for unknown links on your website:

htxp://instagram.com/artursadlos → ’ instagram ’
htxp://www.inprnt.com/gallery/artursadlos/ → ’ prints ’
htxp://instagram.com/artursadlos → ‘instagram’
htxp://www.inprnt.com/gallery/artursadlos/ → ‘prints’
htxp://www.inprnt.com/manage/print/whale-rider-2/ → ‘here.’
htxp://instagram.com/artursadlos → ‘’
htxp://pinterest.com/artursadlos → ‘’
htxps://www.behance.net/artursadlos → ‘’
htxp://artursadlos.tumblr.com → ‘’

polonus (volunteer website security analyst and website error hunter)