The tie will be in Switzerland, yep. Hopefully they can put it on clay because that severely weakens Arvidsson and Larsson, while helping out Timea and Patty (depending on if she is still playing). Great chance for Switzerland.
The tie will probably be held on clay. Since it is too expensive to make indoor clay courts and still too cold for playing outside in most of Switzerland, the Swiss Federation is expected to play in the south - ticino - probably in Lugano or Ascona, where it is usually like 5 °C warmer in april