We visited the Santa Maria delle Grazie church with Leonardo da Vinci’s “Last Supper" mid February 2019 and can add / confirm the following to the below reviews:

Unless you are very lucky you won’t get in without a reservation and the reservation process is still ‘hit and miss’. Unless you are on a (expensive) tour which includes a visit to the Last Supper, tickets have to be booked through the Vivaticket website (https://www.vivaticket.it/eng/event/cenacolo-vinciano/26482).

The website mentions on which date tickets for the following months are released, e.g. in our case the tickets for February and March 2019 were released on December 11, 2018. Be ready to order as soon as possible on these release dates (and register in advance) since in a couple of minutes all tickets for popular days (i.e. Saturday and Sunday) will be sold out. In our case, only a timeslot including a guided tour in Italian was still available. This adds another EUR 3.5 to the EUR 12 ticket price and has to be booked separately.

When visiting the church, you first have to swap your online confirmation for a paper ticket in the ticket office. Since we booked a guided tour, we expected a guide but strangely enough this was not the case. However, we (and everyone with the same timeslot) did receive an audioguide which – since we don’t speak Italian – was a better option than a guided tour in Italian.      

It is now permitted to take pictures but only without flash. As mentioned, the visit lasts for 15 minutes which we felt is enough to admire the painting but a bit short if you want to listen to the full audioguide commentary.

The church is best reached by getting off at metro station Conciliazione (red line). From there it is a 5 minute walk and signs are available as from the metro station.