Interesting that it's got a DAC. I nearly bought a rack full of old Akai studio decks at an aution once just out of curiosity, because they also had this, but then common sense and low WAF prevailed
I'd say you're pushing your luck in this dept these days unless she happens to have a large cassette collection...
If you want to have a deck for playing back such a collection, or for the occassional recording the main factors are really to do with build quality.
Decks from the '90s are pretty poor in this dept, even the Nakamichi's, and try to make up for it with clever electronics which is all well and good until they go out of alignment, which they inevitably do much more quickly, and then they cost even more to service.
Unless it's something really expensive like a Dragon then it's really not worth it quite frankly.
I'd use this Pioneer until it gives up the ghost and then if you still want a deck, go for a 2nd hand Nak, Studer, Revox, Tandberg ...etc. Pioneer did make some fine decks but the best stuff as I mentioned is late '70s to early '80s. Build quality nosedived around 1982-3 for economic reasons. Bang and Olufsen Beocord 5000 is a bit of a sleeper if you want something top class but less expensive.
Professional servicing is going to be expensive anywhere. Several hundred USD at least and if you pick up a deck other than from a service agent it's going to be necessary too.
That said you can pick up tapes in thrift stores almost for free these days and with a really good properly set up deck there is not much if any compromise of quality over CD or vinyl.