The Bar/Lounge at Sonder Park House
Hotel Piet Hein's bar/lounge is endorsed by travel writers. Of the 6 professionals that we tracked, 5 referenced the bar/lounge, like Frommer's, Lonely Planet and DK Eyewitness.
Sonder Park House 
Frommer's
Lonely Planet
DK Eyewitness
Rough Guide
Oyster
Frommer's "In summer the bar sets tables and chairs out on the garden terrace"
Lonely Planet "There's a garden and bar"
DK Eyewitness "There is a late-opening bar and relaxing lounge area, and the staff are helpful, too"
Rough Guide "There's also a comfy bar
that's open till 1am"
Oyster "There are also a cozy lounge and bar indoors, which, like the guest rooms, are decorated in muted earth tones and with high-quality wood and leather furnishings"
