Most of the “devices” for digitizing tapes are cheap throw-away pieces of kit - if you have access to a decent tape deck than you will probably be better off using that.
If your PC has a line-input and not just a mic input (desktops often do - most laptops don’t) tha all you should need is a lead to connect the two devices. If not than you could consider one of the external soundcards that we know work well with Audacity - see this sticky thread: Sound Card Reviews
I had my Nak deck professionally serviced before I did my tape transfers - but even a good “home service” should benefit the results: in particular clean the transport mechanism, the capstan and the pinch roller as tape dust builds up over the years (don’t use alcohol based solvents).
WC