diff --git a/conf/systemd.service b/conf/systemd.service
index c9aed58..2c69049 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -7,7 +7,7 @@ User=__APP__
 Group=__APP__
 WorkingDirectory=__DATA_DIR__/
 
-ExecStart=__DATA_DIR__/venv/bin/gunicorn --config __DATA_DIR__/gunicorn.conf.py FastAPIAppFolder:app --worker-class uvicorn.workers.UvicornWorker
+ExecStart=__INSTALL_DIR__/venv/bin/gunicorn --config __INSTALL_DIR__/gunicorn.conf.py FastAPIAppFolder:app --worker-class uvicorn.workers.UvicornWorker
 
 StandardOutput=syslog
 StandardError=syslog
diff --git a/manifest.toml b/manifest.toml
index 8e1f9ff..3ddc348 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -41,6 +41,8 @@ ram.runtime = "50M"
     [resources.system_user]
     # This will provision/deprovision a unix system user
 
+    [resources.install_dir]
+
     [resources.data_dir]
     # This will create/remove the data dir as /home/yunohost.app/$app
     # and store the corresponding setting $data_dir
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 9ce0c03..f7cb326 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -22,8 +22,8 @@ log_level="WARNING"
 # SET CONSTANTS
 #=================================================
 
-# e.g.: point pip cache to: /home/yunohost.app/$app/.cache/
-XDG_CACHE_HOME="$data_dir/.cache/"
+# e.g.: point pip cache to: /var/www/$app/.cache/
+XDG_CACHE_HOME="$install_dir/.cache/"
 
 log_path=/var/log/$app
 log_file="${log_path}/${app}.log"
@@ -34,22 +34,23 @@ log_file="${log_path}/${app}.log"
 
 myynh_setup_python_venv() {
     # Always recreate everything fresh with current python version
-    ynh_secure_remove "$data_dir/venv"
+    ynh_secure_remove "$install_dir/venv"
 
     # Skip pip because of: https://github.com/YunoHost/issues/issues/1960
-    python3 -m venv --without-pip "$data_dir/venv"
+    python3 -m venv --without-pip "$install_dir/venv"
 
-    chown -c -R "$app:" "$data_dir"
+    chown -c -R "$app:" "$install_dir"
 
     # run source in a 'sub shell'
     (
         set +o nounset
-        source "$data_dir/venv/bin/activate"
+        source "$install_dir/venv/bin/activate"
         set -o nounset
         set -x
-        ynh_exec_as $app $data_dir/venv/bin/python3 -m ensurepip
-        ynh_exec_as $app $data_dir/venv/bin/pip3 install --upgrade wheel pip setuptools
-        ynh_exec_as $app $data_dir/venv/bin/pip3 install -r "$data_dir/requirements.txt"
+        ynh_exec_as $app $install_dir/venv/bin/python3 -m ensurepip
+        # using --no-cache-dir option because user doesn't have permission to write on cache directory (don't know if it's on purpose or not)
+        ynh_exec_as $app $install_dir/venv/bin/pip3 install --no-cache-dir --upgrade wheel pip setuptools
+        ynh_exec_as $app $install_dir/venv/bin/pip3 install --no-cache-dir -r "$install_dir/requirements.txt"
     )
 }
 
@@ -72,5 +73,9 @@ myynh_fix_file_permissions() {
         # /home/yunohost.app/$app/
         chown -c -R "$app:" "$data_dir"
         chmod -c o-rwx "$data_dir"
+
+        # /var/www/$app/
+        chown -c -R "$app:" "$install_dir"
+        chmod -c o-rwx "$install_dir"
     )
 }
\ No newline at end of file
diff --git a/scripts/install b/scripts/install
index 804b330..d428c24 100755
--- a/scripts/install
+++ b/scripts/install
@@ -55,7 +55,7 @@ ynh_use_logrotate --logfile="$log_file" --specific_user=$app
 #=================================================
 ynh_script_progression --message="Create and setup Python virtualenv..." --weight=45
 
-ynh_add_config --template="requirements.txt" --destination="$data_dir/requirements.txt"
+ynh_add_config --template="requirements.txt" --destination="$install_dir/requirements.txt"
 
 myynh_setup_python_venv
 
@@ -64,7 +64,7 @@ myynh_setup_python_venv
 # ================================================
 ynh_script_progression --message="Create $app configuration files..."
 
-ynh_add_config --template="gunicorn.conf.py" --destination="$data_dir/gunicorn.conf.py"
+ynh_add_config --template="gunicorn.conf.py" --destination="$install_dir/gunicorn.conf.py"
 
 mkdir -p "$data_dir/FastAPIAppFolder"
 ynh_add_config --template="__init__.py" --destination="$data_dir/FastAPIAppFolder/__init__.py"