Ulises apartment is clean, convenient, spacious, comfortable, secure and wonderful! His mother, Susana, who lives there, is helpful. Though there was somewhat of a language barrier (my Spanish is poor!), she was patient and friendly.
When I wasn't able to communicate with her, i could always message Ulises for help. It seems they have thought of everything! I was there a full week and didn't need anything that wasn't available.
The location is great, as well. La Latina has a great night life. The main strip is just behind the apartment, actually. The metro is just outside, but I actually didn't use it much. La Latina is essentially part of Madrid's center which is very walkable.
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