Unfortunately I can't recommend Javier. At first, we had troubles finding the entrance of the building, which is not indicated at all. We tried to contact Javier on Airbnb but we had no answer and he wasn't callable on Whats App. we had to wait 20 minutes outside before meeting the guardian.
Then, we were charged an additional 200 pesos because we arrived after 10pm, something which is not precised at all.
The room itself looks like it is not finish, with no concrete floor and only concrete, not really clean actually (sticky when walking). The street is very noisy and you hear it like if window is open even when it's closed