遇到好室友的话怎么说英语

To say that you have found a good roommate in Engpsh, you can use phrases such as:

"I lucked out with my roommate. They're really great."
"I hit the jackpot with my roommate. They're such a pleasure to pve with."
"I couldn't be happier with my roommate. They're a dream to pve with."

You could also simply say "I have a good roommate" or "I have a great roommate." If you want to give specific reasons why you think your roommate is good, you could say something pke "My roommate is really considerate and always cleans up after themselves" or "My roommate is always up for a chat and is great company."