KeymoFrisby - I'm in the same boat as you - I live in a ground floor flat, where the front is bedroom and bathroom, and in the back there is open plan living room and kitchen, it's like living in a box. It helps that my dog is no where near 62lbs, but it still makes indoor umbilical totally monotonous

We have no stairs to practice (my puppy is still useless at stairs - but I'm not complaining because we'll be moving to somewhere much bigger in June and I'm hoping to make upstairs off limits to my dog.)
So I'll have him on umbilical while I'm watching TV, cooking, washing up, and cleaning up the garden (we have a garden that's like the same size as the flat, so that's one good thing!)
I think it's good thing though, because I can use the park for obstacles and running around, but in such a small space as our flat, my dog really has to be watching where my feet are going - so they're not landing on his head!!

I can imagine about the things he could get his paws on at the back of your place - around my place there's my make-up, jewelery, perfume, stuff like that... my dog tries now and again but can't quite reach! I'd suggest you just take him there on umbilical one day, act normal, and see how he is - he might just surprise you and make no attempt to grab anything... and if he does, correct him. it'll be reassuring if you know he can be in a room full of stuff and not touch anything! Give it a go!
