Hack the router? Sounds like you had a wireless access point in the router that was either unsecured or poorly secured (WEP). There is no "hacking" a WPA2-secured wireless network that has a strong key.
How did the other tenants know it was yours? I'd highly recommend using a SSID (network name) that is generic to your name or location.
I used my first name as the name of the router. go ahead and laugh. it was my first time setting one up and I named it after myself. so it was pretty easy to figure out where it originated. I'm not slamming routers I just had a bad experience. Same with bluetooth. Dell blows. This is my last PC by the way. I'm over it. I have a keyboard and mouse that connects with blue tooth and when the battery gets weak it loses it's link and when I put in new batteries it shows the keyboard but it doesn't work, won't link up. It then takes me a day sometimes many days to re-sync. It has made me wary of bluetooth technology. Oh when it does link up it shows all my neighbors devices and asks me if I want to link up to their equipment. I had a bad experience with this PC and it's glitchy things which I no longer want to tolerate. Microsoft products are not good. sorry for ranting.
There is no "hacking" a WPA2-secured wireless network that has a strong key.
YET. WPA2 AES is Probably (as far as we know) the best choice AFTER wired. But once upon a time, wpa-tkip was good, before that WEP was...... Broadcast it and they will come........