This looks like it has a nice overstrung frame. It would be interesting to see a picture of the action and the hammer felts. I completely understand why you want to save it. If it were in my house, I would vacuum the inside, and then do the repair as above, getting it as clean as I could first. This makes it less appealing to moths etc, and allows you to look for other problems. If you are feeling very brave, take the keys out one by one, vacuum underneath, or just vacuum around them in situ. Make sure no paper spacers or felts get sucked in if removing the keys, and be careful to put them back in the right place (they are usually numbered). I would then tune it to its self (without raising too many notes) using a PC tuning program or whatever, and get it to hold some sort of tune. If it holds tune you could have an attractive little piano that you can enjoy, and perhaps even sell if you move again.
I don't know what the action is like, or the dampers, so I will assume the worst. In this case I would not try to learn to play Mozart on it from scratch, the cheapest way might be to get a digital for that. But learning/playing ragtime, pub piano music, it could be great fun. When I had the luxury of two acoustic pianos in the house, one was something like this (actually not as good). The other was quite a bit more modern and more precise.
So not worth spending on (in terms of professional labour and return on investment), but well worth fixing yourself. Many piano parts can be sourced quite reasonably for DIY. You could end up with some attractive and functional furniture that may well hold tune.