ASA 5505 and NAT rule

I have an ASA 5505 and I need to open up some ports to an host. I started with port 22 (SSH) but without success. Can anyone help out with the commands to do this? Here's my running-config.

[code:1]
: Saved
:
ASA Version 8.3(1)
!
hostname flufirewall
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
!
interface Vlan1
nameif inside
security-level 100
ip address 192.168.157.250 255.255.255.0
!
interface Vlan2
nameif outside
security-level 0
ip address 85.39.XXX.XXX 255.255.255.248
!
interface Ethernet0/0
switchport access vlan 2
!
interface Ethernet0/1
!
interface Ethernet0/2
!
interface Ethernet0/3
!
interface Ethernet0/4
!
interface Ethernet0/5
!
interface Ethernet0/6
!
interface Ethernet0/7
!
ftp mode passive
clock timezone CEST 1
clock summer-time CEDT recurring last Sun Mar 2:00 last Sun Oct 3:00
object network obj_any
subnet 0.0.0.0 0.0.0.0
object network inside-network
subnet 192.168.157.0 255.255.255.0
object network inside-net
subnet 192.168.157.0 255.255.255.0
object network Webserver
host 192.168.157.240
access-list OUTSIDE-IN extended permit tcp any host 192.168.157.240 eq ssh
pager lines 24
logging asdm informational
mtu inside 1500
mtu outside 1500
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
nat (inside,outside) source dynamic any interface
!
object network inside-net
nat (inside,outside) dynamic interface
object network Webserver
nat (inside,outside) static interface service tcp ssh ssh
access-group OUTSIDE-IN in interface outside
route outside 0.0.0.0 0.0.0.0 85.39.XXX.XXX 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
dynamic-access-policy-record DfltAccessPolicy
http server enable
http 192.168.157.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address 192.168.157.200-192.168.157.205 inside
dhcpd dns 208.67.222.222 interface inside
dhcpd enable inside
!

threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
webvpn
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
message-length maximum client auto
message-length maximum 512
policy-map global_policy
class inspection_default
inspect dns preset_dns_map
inspect ftp
inspect h323 h225
inspect h323 ras
inspect rsh
inspect rtsp
inspect esmtp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp
inspect ip-options
!
service-policy global_policy global
prompt hostname context
Cryptochecksum:693b673b0881f34c0f177df73f8a15b8
: end
no asdm history enable
[/code:1]

sorry i dont have time to go through the whole config.
but this video explains how NAT works in 8.3 really well

supportforums.cisco.com/videos/1078

It looks ok. Maybe remove the ssh timeout value in case it thinks you are trying to ssh into the asa.

do a sh xlate to see if it adds the PAT to the required host.

You can also try to use this:
access-list OUTSIDE-IN extended permit tcp any object Webserver eq ssh

If that doesn't work, check if your software antivirus/firewall on your host is blocking.