Meaning of a Jane Austen fragment in this letter

The OED’s definition 14a is That one derives pleasure or satisfaction from; agreeable, pleasant, satisfactory; attractive and the word seems to have been used in that sense from at least the mid-eighteenth century. Indeed, it may even have become a little too popular, if we are to judge by the words that Jane Austen herself puts into the mouth of Henry Tilney in 'Northanger Abbey':

‘I am sure,’ cried Catherine, ‘I did not mean to say any thing wrong; but it is a nice book, and why should not I call it so?’ ‘Very true,’ said Henry, ‘and this is a very nice day, and we are taking a very nice walk, and you are two very nice young ladies. Oh! it is a very nice word indeed!—it does for every thing.’

I propose these from the OED:

14.
a. That one derives pleasure or satisfaction from; agreeable, pleasant, satisfactory; attractive.

f. Of a (finished) action, task, etc.: well-executed; commendably performed or accomplished.