まず当方のシステム環境です。
macOS Sierra
Apache: 2.4.25 (Unix)
mysql: stable 5.7.19

サーバーを立ち上げ、

http://localhost/

へアクセスするも、

Forbidden　You don't have permission to access / on this server.

エラーログは、

Cannot serve directory /users/ユーザー名/Sites/: 
No matching DirectoryIndex (index.php,index.html,index.html,index.php)found,     
and server-generated directory index forbidden by Options directive

httpd.conf（変更点）

# LoadModule userdir_module libexec/apache2/mod_userdir.so #コメントアウト
# LoadModule alias_module libexec/apache2/mod_alias.so #コメントアウト
# LoadModule rewrite_module libexec/apache2/mod_rewrite.so #コメントアウト
# LoadModule php5_module libexec/apache2/libphp5.so #コメントアウト

DocumentRoot "/users/ユーザー名/Sites/"
 <Directory "/users/ユーザー名/Sites/">
#
# Possible values for the Options directive are "None", "All",
# or any combination of:
#   Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
#
# Note that "MultiViews" must be named *explicitly* --- "Options All"
# doesn't give it to you.
#
# The Options directive is both complicated and important.  Please see
# http://httpd.apache.org/docs/2.4/mod/core.html#options
# for more information.
#
Options FollowSymLinks Multiviews
MultiviewsMatch Any

#
# AllowOverride controls what directives may be placed in .htaccess files.
# It can be "All", "None", or any combination of the keywords:
#   AllowOverride FileInfo AuthConfig Limit
#
AllowOverride All

#
# Controls who can get stuff from this server.
#
Require all granted

　　

Include /private/etc/apache2/extra/httpd-userdir.conf #コメントアウト

ユーザ名.confも作成し、

/apache2/users/ユーザ名

<Directory "/Users/ユーザ名/Sites/">
AllowOverride All
Options Indexes MultiViews
Options +FollowSymLinks
Require all granted
</Directory>

として入れてあります。

未熟な私に解決方法をご教授ください。
よろしくお願いいたします。