1700 is a little high, you can do better than that, or if you pay that you can at least have a better location (not that Old Praga is bad, just that for 1700 you could be in the very center of the city).
In a modern secured block, full mod cons and a 10 minute walk (or 2 tram stops) to Stary Miasto -well worth the money and I have never had any problems renting it out at this price.