Jack isn't quite right when she says that the only thing you need to worry about is changing the external appearance. It's a very common mistake, though, and a lot of people (including builders and estate agents) will repeat it.
If you live in a listed building, you can't make any changes that will alter the historic fabric of the building without first getting Listed Building Consent. That means that you can't alter the historic fabric inside as well as outside.
Most obviously, you can't knock down an original wall without LPC. You also can't make holes in the ceilings for recessed light fittings, put new windows in existing walls, change the windows without LPC, etc etc.
I can't imagine that putting shelves up would be a problem, and if the tiles are modern, then that wouldn't be an issue either. However, it's always worth being prepared for surprises, and telling your builders to be extremely careful when taking things out - you might find an original floor under the modern tiles. We've found the original Tudor wall, complete with wattle and daub, behind some 60s fitted wardrobes, for example. Luckily our restoration builder was working on the house that day and so recognised immediately what they'd found and stopped anyone attempting to knock through!
You can make repairs, but not changes - what is a repair and what is a change can be a tricky subject, and the easiest thing to do is to phone up the Conservation Officers and outline the specific work you want to do. I suspect that the COs will be more flexible about calling something a 'repair' if they are happy with your general approach to the building.
You can put climbing plants up the outside of the building, but you should be very careful about causing damp issues.
I would say that living in a listed building is a very considerable added hassle and expense, although I'm aware that not everyone finds this (lucky bastards!). Ours is a major restoration project rather than buying a finished house, which may be the problem, but we're having to put in for repeated LBCs, which is hard work and time consuming. We also have to use specialist, more expensive tradespeople for every job, and buy much more expensive materials. For example, I can't go and buy Dulux paint to repaint our bedroom this week - it needs to be paint suitable for lime plaster. Really, it is like being on one of these TV programmes!
There are also additional issues around things that would normally be passed - believe it or not, we've needed Planning Permission to put up a small greenhouse, which included a visit from the local Parish Council.
I hope this helps (it's rather a spiel!) - if you have specific questions or want to PM me the sales details of the house, please do.