We also live in a warehouse in London so the slightly grimey entrance of the building wasnt really a concern for us.
The place was ok just quite dark as there is only a tiny window.
We came for a week with our 2 years old daughter and i definitly wouldnt recommend it if you also have a child.
The mezzanine upstairs is very low and the barrier is not secure enough for children. Also there was no bed/bedding to accomodate our daughter so we had to improvise and make a makeshift bed with two sofa cushions and a blanket.. not ideal.
Otherwise the area was good (if you like industrial and artistic) with loads of amenities close by.
Would recommend this property if you dont have little kids with you.