Is this a good deal? Basso Astra Ultegra Di2 (used, €1100)

Hey everyone,

Tomorrow I'm going to check out this used Basso Astra and could really use some expert opinions before I buy it.

Here are the details from the seller:
– Size 53
– Shimano Ultegra Di2 11-speed
– Disc brakes (rotors replaced this year)
– Crankset: 52/36 – 172.5 mm
– Edco Pillon DB carbon wheels
– Specialized Toupe saddle (143 mm)
– Full carbon frame, handlebar, stem, seatpost, and wheels
– Repainted in 2021
– Continental GP5000 25 mm tires
– Comes with Di2 charger
– Asking price: €1250, my 1100€ offer was accepted

The bike looks great in photos, but I’m not super experienced with carbon bikes or Di2, so I’d really appreciate feedback on:
– Whether this seems like a fair price
– Any known issues with this model
– What to check for when inspecting/testing it (frame cracks, Di2, etc.)
– Any red flags you notice from the photos

I'm 176 cm tall (5'9") — wondering if size 53 sounds right too.

Thanks a lot for your help 🙏