We only checked out the restaurant, but it has _by...

We only checked out the restaurant, but it has _by far_, and I mean, more than any coworking space I've visited in Cusco (checked out 3 of them), by far the fastest upload speed of any WiFi in Cusco: I measured 35Mbps.
Download was kinda slow with 15-20Mbps, but the upload speeds here are literally to die for compared with the rest of the city.

The only downside was that they didn't allow our little dog so we had to leave pretty soon again. I think if they adopted a pet-friendly policy, the restaurant of the Hotel Mercado would be the optimal place for digital nomads. Obviously it's a high-star hotel so the prices of food and drinks reflect that, but if you need the fastest upload speeds in Cusco, come here.