Flight
Athens airport is where you'll fly into! Most airbnb hosts and hotels can arrange transportation to and from the airport with taxis or you can take an Uber.
Hotel
Niko and I always recommend the local airbnbs! It's usually a better value and there are soooo many all over the city. Look in the Glyfada, Voula, or Vouliagmeni area to be in the 15 minute radius to the wedding venue.
Hotel
Hotel
The London Hotel is in Glyfada. It is the next neighborhood over from the venue. A great neighborhood to explore.
Travel Note
If you're planning to island hop before or after the wedding, the ferries leave out of Piraeus port. Take the arrival times the tickets give you seriously as they board quickly. I would suggest taking the bigger ferry ships as its less likely to get seasick.