Farmall Cubs are great little tractors. I've owned and used many over the years. I love them. For what you are planning to do with it I think the Cub would be perfect. Easy to work on. Parts widely available. Fun to drive. And for simply mowing a few acres it will be a great tool.
Though I love Cubs, I did sell all of mine and would not buy one again for actual practical use. Here's why just FYI....
1) The PTO shaft is a smaller diameter than all other tractors out there...and runs in reverse to all other tractors. So it's not very convenient. You just can't go and buy any generic brush hog or flail mower or any other PTO driven implement. You have to buy very specific equipment that was made for the Cub.
2) No 3 point hitch. Some Farmall Cubs do have a Fast Hitch which is very convenient for switching quickly between plows and harrows without even getting off the tractor. But without a standard 3 point hitch, you are limited again to only those implements made for the Cub.
3) Because of #1 and 2#, Cub owners must find very specific implements made specifically for Cubs...and these are becoming hard to find and rare. Cubs and their implements are highly sought after, and thus expensive.
4) Underpowered....depending on the year...between at 10 to 15 hp.
But again, for what you are doing you'll be fine.