WiFi was nonexistent 90% of the time, in common area as well as in apartment. Reception was closed when we arrived (during regular check-in hours, though on Sunday), and we had to wait for ~20 min for someone to let us in. Staff did not speak English, Russian, German, or French, which made it difficult to ask for missing amenities.
Apartment was clean and comfortable, with a lot more room and comfort than we'd expected for the price. Kitchen had a good assortment of dishes, bathroom with tub was nice, and there was even a little balcony. Great location, walking distance to Stary Smokovec (supermarket, hikes, tourist info, restaurants and cafes) and very close to train stop ("Sibir").