Mamikos.com is a very popular boarding house or apartment search website in Indonesia. The number of students or people who want to find a place to live is the cause of one of the factors the website is created. but today, there are still many people who do not know about the website or application and its use in their lives. So based on this, the researchers tried to make a social research experience about the usefulness of the Mamikos.com website. The purpose of this study is to determine the usability of this website in accordance with the criteria of usability. The sample used in this study was 88 respondents who were randomly selected using the lameshow formula. This study uses a usability approach using the Nielsen heuristic method in finding the usability of the website. The results of research using Nielsen Heuristics can show that the Mamikos.com website has a very good usability level with a percentage of 46% from 50%.