At Tuco, aperitifs take on the Italian accent and the golden light of an endless summer. When the patio bar swaps its glass roof for a rooftop, the whole of Paris takes on the air of the Italian Riviera. With deckchairs, Spritz twists, shared plates and a Nordic bath overlooking the capital's rooftops, Hôtel Wallace is the sunniest (and thirstiest) spot of the season in the 15th arrondissement.