We (4 people) stayed at Guillermo's place for 2 nights. The space is exactly as described and Guillermo is a great host. The communication with him was smooth and so was the checkin process. Also, the location is convenient as well (bus stop and metro station closeby).
Just a few things to note though:
1] The space has no doors (except for bathroom which has no lock) on either of room so if privacy is important then it would be inconvenient.
2] During our stay there was water issue linked to flush (though was explained promptly by Guillermo)
3] Some electricity tipping issue but was immediately fixed by host when we mentioned.
Overall we had a great stay and would recommend Guillermo's place.