1.2 level 2 skill check: commas
add and/or remove commas  where necessary in this extract.
however
it
is
not
only
the
hotel’s
location
that
makes
staying
here
a
pleasant
experience.
free
wifi
makes
getting
online
a
piece
of
cake,
whilst
every
room
is
en-suite
and
comes
complete
with
a
lockable
safe,
for
your
valuables,
and
possessions.
although,
we
are
located
within
easy
reach
of
the
city’s
major
tourist
attractions,
the
area
surrounding
us
is
actually
one
of
the
quietest
sections.
 

© bksb 2019

However, it is not only the hotel's location that makes staying here a pleasant experience. Free Wifi makes getting online a piece of cake, whilst every room is en-suite and comes complete with a lockable safe for your valuables and possessions. Although we are located within easy reach of the city's major tourist attractions, the area surrounding us is actually one of the quietest sections.

Explanation:

However(,) it is not only the hotel's location that makes staying here a pleasant experience. Free Wifi makes getting online a piece of cake, whilst every room is en-suite and comes complete with a lockable safe() for your valuables() and possessions. Although() we are located within easy reach of the city's major tourist attractions, the area surrounding us is actually one of the quietest sections.

There are three changes in the sentence. First is the addition of comma after however, then the commas after safe, valuables and although are removed.

recent brain research has shown some surprising benefits as a result of formal musical training. learning to play a musical instrument appears to develop parts of the brain that can even influence academic results. the studies indicate that the earlier a child begins training, the more benefits there are. one such study showed that children who began musical studies before the age of seven had a more developed brain in the region where language production and auditory processing take place. scientists believe there is mounting evidence to show that early musical training can improve brain function.

explanation: