Long bed?

With 1.80m I wouldn't describe myself as being tall in Europe - well that's different in China. The friendly housing agent (~1.50m) showed me this nice appartment and was suprised that I measured the length of the bed. Somehow it looked short to me and turned out to be "only" 1.80m long. I tried to explain her that this might be to short for me but I didn't succeed - looking up with big eyes she said "what's the ploblem sil?"