They charge Rp 100K (around $11) additional price on new year holiday, and we must pay in advance when booking. Quite a reasonable policy, considering how difficult it is to find a decent room in yogya for NY holiday. The room itself is not spacious, just adequate, but very clean. There are no windows in the room, but the door leads to an open hallway, so it's not too claustrophobic. The most expensive room has mini-fridge inside. They also have free wifi/internet connection, and I was fortunate because the signal reception in my room is quite good.
Breakfast is served in the room, but you can eat it on the restaurant/hotel balcony while watching morning traffic in Dagen. Too bad you can only have toast with tea/coffe for breakfast, not many choices. The balcony itself has see-through glass floor, so watch out when you're wearing skirts :)
The location is superb. I love Dagen street because it's really close to Malioboro, but not as crowded as Sosrowijayan. You can find old grannies that sell beef satay on the side entrance of Beringharjo Market at noon. While at midnight, there's a stall that sells wicked fried pigeon in front of Terang Bulan batik store (look for SBTB sign).