We spent 4 months in Christian's apartment and would definitely stay there again!
Its central location is unbeatable (less than 5 minutes to Times Square, subway, many stores and restaurants) and we always felt safe.
The apartment has a good size for two people and is really well equipped, including kitchen and cleaning supplies (even vaccuum), Apple TV, tons of storage space, ...
Communication with Christian was great and he promptly took care of any questions/issues we had.
All in all, we had a perfect time and would would recommend Christian's apartment to friends and family.