I have a Perkeo II and a Perkeo I. I've used the Perkeo II relatively often and think it's one of the best medium format cameras I've tried.
I also have a Mamiya 645 package, which is a perfectly good camera, only it's easier to pick up and use the Perkeo.
The Perkeo I has an only slightly more flimsy design than the Perkeo II (of the ones I have, some knobs and details made of plastic instead of metal), but it has one advantage - it does not feature the anti-double exposure failsafe of the Perkeo II, which tends to work poorly with the years, and more often than not stands in the way of turning the film to the next frame (only 80% of it or so), you can simply turn the frame counter back to zero on the Perkeo II for every picture to ignore this, but I guess it would be better not having to do that all the time.
Oh wait, it has double exposure prevention? (Read this after I posted)
Then are you sure you don't have the Perkeo II?
Any way - I think the Perkeo is one of the best folding cameras available, and I can't for the life of me understand why people want to buy any old Bessas with the inflated price thanks to the newer Bessa, so yeah, good catch.
As far as focussing goes, you have a few alternatives.
1. Carry an SLR with a simple lens.
2. Learn zone focussing.
3. Search far and wide for a seperate rangefinder.
4. Make sure to use it in strong sunlight so you can stop down and...
5. Just make a wild guess (I've done this quite often with the Voigtländer).
For the mechanics - just drop a few drops of lighter fluid down the mechanics to remove internal dust.
PS: On the right side of the P on your keyboard there should be a "¨" button (somewhere left of the "return" key).
If you press "¨" and then the letter such as a or o you get the German/Swedish letters used in Voigtländer.
In Swedish, not sure about German, the ä is more similar to the e sound than the a.