take the train to Montevarchi-Terranu and a taxi from there.>

Train from where? Siena - Empoli - Florence?

Rome2rio said it was Cavriglia.

Jeez. The post said Florence, so Florence.

take the train to Montevarchi-Terranu and a taxi from there.>

www.bahn.de/en says it's a short 40-minute train trip from Florence SMN - main station and a bit shorter from Florence Campo di Marte (which could be closer to your hotel or not) - a main secondary station - regional trains so just buy ticket once at the station - good for any regional train that day (I think) and just a few euros. No reserved seats possible. Hourly or more frequent trains.

Palenq says, "But, you can take a train from Florence into Tuscany!"

That's like saying you can take a train from Trenton into New Jersey.

That's like saying you can take a train from Trenton into New Jersey.>

Exactly!

Capiche?

>>>Agriturismo La Forra is in Cavrigli, not Chianti. <<<

It's actually outside the town of Montegonzi (comune of Cavriglia, Province of Arezzo).

AGRITURISMO LA FORRA
52020 MONTEGONZI
CAVRIGLIA (AR) - ITALY

http://www.comune.cavriglia.ar.it/the-villages

PQ - You can't assume there will be taxis at small stations as often there aren't. The OP might be able to arrange a driver (perhaps from the villa) to meet her at Montevarchi train station or at the bus when it arrives in Montegonzi.

And here is the weather forecast for the part of Chianti that's in the privince of Arezzo

http://meteo.repubblica.it/meteo/ita...ti/TOS/AR/oggi

Montevarchi is the location of an enormous shopping outlet/mall. I would expect to find plenty of taxis in Montevarchi, but OP should check with the agriturismo or whomever is arranging the work sessions about best way to get there.