"brew services list" shows postgresql as "started", but can not connect to it

Hello!

I am trying to move from (successfully) using VM Fusion with CentOS Linux
image on Mac OSX "El Capitan" for web development to Homebrew:

brew update
brew install postgres
brew tap homebrew/services

This resulted in some files installed to

/usr/local/Cellar/postgresql/9.5.1/

And "brew services list" reports it as "started":

postgresql started afarber
/Users/afarber/Library/LaunchAgents/homebrew.mxcl.postgresql.plist

And I can restart it:

# brew services restart postgresql
Stopping `postgresql`... (might take a while)
==> Successfully stopped `postgresql` (label: homebrew.mxcl.postgresql)
==> Successfully started `postgresql` (label: homebrew.mxcl.postgresql)

But unfortunately I can not connect with "psql":

psql: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5432"?

And there is no "pg", "post" or "master" in "ps uawwwx" list.

And I can find neither postgresql.conf nor pg_hba.conf nor any startup logs
at my Macbook Air.

In the troubleshooting process I have tried:

xcode-select --install
brew update
brew update
sudo chown -R $(whoami) $(brew --prefix)

and restarted the Macbook and finally filed an issue at
https://github.com/Homebrew/homebrew/issues/50065

If you are using Homebrew PostgreSQL package at the latest Mac OSX, please
share some tips on how to get it running or at least proceed in debugging.

Thank you
Alex