HUGE loss function

I solved the standard task of predicting the price of a house, but my loss function does not decrease after few steps. I tried to change the learning speed, add and delete hidden layers, change the activation function. In general I did all the standard actions but the loss function is still huge
Here is my code
Here is dataset
HUGE thanks, if u find my mistake and explain to me what’s wrong


The magnitude of your target is very high, this implies that your loss value is high.

If you analyze your code you can see the loss value, after the ending of training, aroud 70000.

If you do sqrt(70000), you got an mean error of 294 in prices, what is reasonable.