{'response': {'count': 1, 'items': [{'conversation': {'peer': {'id': 204697425, 'type': 'user', 'local_id': 204697425}, 'in_read': 87, 'out_read': 88, 'last_message_id': 88, 'unread_count': 1, 'unanswered': True, 'can_write': {'allowed': True}}, 'last_message': {'date': 1542794772, 'from_id': 204697425, 'id': 88, 'out': 0, 'peer_id': 204697425, 'text': 'd', 'conversation_message_id': 7, 'fwd_messages': [], 'important': False, 'random_id': 0, 'attachments': [], 'is_hidden': False}}], 'unread_count': 1}}

 dct = {'response': {'count': 1, 'items': [{'conversation': {'peer': {'id': 204697425, 'type': 'user', 'local_id': 204697425}, 'in_read': 87, 'out_read': 88, 'last_message_id': 88, 'unread_count': 1, 'unanswered': True, 'can_write': {'allowed': True}}, 'last_message': {'date': 1542794772, 'from_id': 204697425, 'id': 88, 'out': 0, 'peer_id': 204697425, 'text': 'd', 'conversation_message_id': 7, 'fwd_messages': [], 'important': False, 'random_id': 0, 'attachments': [], 'is_hidden': False}}], 'unread_count': 1}}
print(dct['response']['items'][0]['conversation']['peer']['id'])
>>> 
204697425
>>>