I used to own a flat in Llanederyn. Used to pay £50 per year Ground Rent and £50 a month maintenance, which I thought was reasonable. The exterior of the flats were updated a few years ago and every flat owner had to pay an equal share of the cost, which they let us pay monthly over a couple of years.
The only thing which I found a bit of a ball ache, was when I sold the place. Had to deal with three sets of solicitors. Mine, the buyer and the leaseholder. Took far longer to complete because of this, than it would with a freehold.