You can simply connect any PETSCII client at bbs.retrocampus.com:6510.
If you're using a traditional plain telnet client, you can connect at port 23.
For a fully functional retro experience, there is a guide written for helping people connecting original devices.
There's a cultural club in Milan, driven by retrocomputing culture. Old school machinery is revived then hacked to connect and revive prehistorical period of Information Technology communications.
That heaven is called Retrocampus