We stayed for a month at Kukun's apartment in Juarez. While there were a few bumps at the beginning of the trip (leaky washing machine, insufficient air conditioning), the Kukun staff responded quickly to the issues and generally resolved them quickly.
I normally live in NYC, but the noise at night was a bit distracting even for us.
Also, I'll encourage the hosts to provide enough key cards for every guest. It is very annoying to ask the front desk staff every time you want to go up to your apartment.
That being said, we always felt safe and comfortable in the apartment. The beds were also quite comfortable.
Generally, would still recommend this apartment to friends.