As someone who previously purchased a leasehold property, I would steer well clear. It was our first home and we were a bit naive to what it entailed, and we didn't really encounter any issues but we could have.
Firstly it isn't advised to purchase a property with such a short lease, think once it gets to around 75 the owner should be looking to extend this, the less time it has on it the more it will cost to extend it. My friend recently extended hers from 70 years and it cost approx £22k so it is very expensive.
Alot of the leasehold companies seem to fall into administration which makes purchases and sales very iffy, this happened to us and took a few months to sort out before we could complete our purchase. This has also happened to some houses near where I now live and technically when the company went bust the land defaulted to the crown so it could be very interesting when any of those people decide they would like to move.....
Leases will also have restrictions and requirements and permission requests entailed, for example ours said we should redecorate every 2 years and ask permission to change anything like windows etc.
Check all paperwork very thoroughly, especially with regards to charges as these may be able to be reviewed and upped at certain intervals.
Basically I would just stay away from it, get a free hold. Yes it may be in budget, but it is in budget for a reason.... Too good to be true comes to mind.